Add undefined check throughout app

Removes both "no execute _computeDiffURL before patchNum is knwon"
and "gr-linked-text with null config" tests.

This is due to behaviour changes in Polymer2 which means functions are
always called regardless if one of the params is undefined.

Change-Id: I4bdbe03f9dc46d03a8d0997055271327f0c2a2ea

polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js

@@ -179,6 +179,7 @@
     },
 
     _computeColspan(changeTableColumns, labelNames) {
+      if (!changeTableColumns || !labelNames) return;
       return changeTableColumns.length + labelNames.length +
           NUMBER_FIXED_COLUMNS;
     },
@@ -250,7 +251,7 @@
 
     _computeItemHighlight(account, change) {
       // Do not show the assignee highlight if the change is not open.
-      if (!change.assignee ||
+      if (!change ||!change.assignee ||
           !account ||
           CLOSED_STATUS.indexOf(change.status) !== -1) {
         return false;

polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.js

@@ -353,6 +353,7 @@
     },
 
     _computeBranchURL(project, branch) {
+      if (!this.change || !this.change.status) return '';
       return Gerrit.Nav.getUrlForBranch(branch, project,
           this.change.status == this.ChangeStatus.NEW ? 'open' :
               this.change.status.toLowerCase());

polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.js

@@ -524,6 +524,7 @@
     },
 
     _computeTotalCommentCounts(unresolvedCount, changeComments) {
+      if (!changeComments) return undefined;
       const draftCount = changeComments.computeDraftCount();
       const unresolvedString = GrCountStringFormatter.computeString(
           unresolvedCount, 'unresolved');

polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog.js

@@ -71,16 +71,17 @@
 
     _computeDownloadCommands(change, patchNum, _selectedScheme) {
       let commandObj;
+      if (!change) return [];
       for (const rev of Object.values(change.revisions || {})) {
         if (this.patchNumEquals(rev._number, patchNum) &&
-            rev.fetch.hasOwnProperty(_selectedScheme)) {
+            rev && rev.fetch && rev.fetch.hasOwnProperty(_selectedScheme)) {
           commandObj = rev.fetch[_selectedScheme].commands;
           break;
         }
       }
       const commands = [];
       for (const title in commandObj) {
-        if (!commandObj.hasOwnProperty(title)) { continue; }
+        if (!commandObj || !commandObj.hasOwnProperty(title)) { continue; }
         commands.push({
           title,
           command: commandObj[title],
@@ -117,6 +118,10 @@
      * @return {string} Not sure why there was a mismatch
      */
     _computeDownloadLink(change, patchNum, opt_zip) {
+      // Polymer 2: check for undefined
+      if ([change, patchNum].some(arg => arg === undefined)) {
+        return '';
+      }
       return this.changeBaseURL(change.project, change._number, patchNum) +
           '/patch?' + (opt_zip ? 'zip' : 'download');
     },
@@ -130,6 +135,11 @@
      * @return {string}
      */
     _computeDownloadFilename(change, patchNum, opt_zip) {
+      // Polymer 2: check for undefined
+      if ([change, patchNum].some(arg => arg === undefined)) {
+        return '';
+      }
+
       let shortRev = '';
       for (const rev in change.revisions) {
         if (this.patchNumEquals(change.revisions[rev]._number, patchNum)) {
@@ -141,6 +151,10 @@
     },
 
     _computeHidePatchFile(change, patchNum) {
+      // Polymer 2: check for undefined
+      if ([change, patchNum].some(arg => arg === undefined)) {
+        return false;
+      }
       for (const rev of Object.values(change.revisions || {})) {
         if (this.patchNumEquals(rev._number, patchNum)) {
           const parentLength = rev.commit && rev.commit.parents ?
@@ -152,6 +166,10 @@
     },
 
     _computeArchiveDownloadLink(change, patchNum, format) {
+      // Polymer 2: check for undefined
+      if ([change, patchNum, format].some(arg => arg === undefined)) {
+        return '';
+      }
       return this.changeBaseURL(change.project, change._number, patchNum) +
           '/archive?format=' + format;
     },

polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.js

@@ -760,6 +760,11 @@
     },
 
     _computeDiffURL(change, patchNum, basePatchNum, path, editMode) {
+      // Polymer 2: check for undefined
+      if ([change, patchNum, basePatchNum, path, editMode]
+          .some(arg => arg === undefined)) {
+        return;
+      }
       // TODO(kaspern): Fix editing for commit messages and merge lists.
       if (editMode && path !== this.COMMIT_MESSAGE_PATH &&
           path !== this.MERGE_LIST_PATH) {

polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_test.html

@@ -1213,22 +1213,6 @@ limitations under the License.
       assert.isFalse(element.classList.contains('loading'));
     });
 
-    test('no execute _computeDiffURL before patchNum is knwon', done => {
-      const urlStub = sandbox.stub(element, '_computeDiffURL');
-      element.change = {_number: 123};
-      element.patchRange = {patchNum: undefined, basePatchNum: 'PARENT'};
-      element._filesByPath = {'foo/bar.cpp': {}};
-      element.editMode = false;
-      flush(() => {
-        assert.isFalse(urlStub.called);
-        element.set('patchRange.patchNum', 4);
-        flush(() => {
-          assert.isTrue(urlStub.called);
-          done();
-        });
-      });
-    });
-
     suite('size bars', () => {
       test('_computeSizeBarLayout', () => {
         assert.isUndefined(element._computeSizeBarLayout(null));

polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row.js

@@ -110,6 +110,9 @@
     },
 
     _computeLabelValue(labels, permittedLabels, label) {
+      if ([labels, permittedLabels, label].some(arg => arg === undefined)) {
+        return null;
+      }
       if (!labels[label.name]) { return null; }
       const labelValue = this._getLabelValue(labels, permittedLabels, label);
       const len = permittedLabels[label.name] != null ?
@@ -138,7 +141,7 @@
     },
 
     _computeAnyPermittedLabelValues(permittedLabels, label) {
-      return permittedLabels.hasOwnProperty(label) &&
+      return permittedLabels && permittedLabels.hasOwnProperty(label) &&
         permittedLabels[label].length;
     },
 

polygerrit-ui/app/elements/change/gr-message/gr-message.js

@@ -203,6 +203,10 @@
     },
 
     _computeScoreClass(score, labelExtremes) {
+      // Polymer 2: check for undefined
+      if ([score, labelExtremes].some(arg => arg === undefined)) {
+        return '';
+      }
       const classes = [];
       if (score.value > 0) {
         classes.push('positive');
@@ -211,6 +215,7 @@
       }
       const extremes = labelExtremes[score.label];
       if (extremes) {
+        const extremes = labelExtremes[score.label];
         const intScore = parseInt(score.value, 10);
         if (intScore === extremes.max) {
           classes.push('max');

polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js

@@ -223,6 +223,9 @@
      * @return {!Object} Hash of arrays of comments, filename as key.
      */
     _computeCommentsForMessage(changeComments, message) {
+      if ([changeComments, message].some(arg => arg === undefined)) {
+        return [];
+      }
       const comments = changeComments.getAllPublishedComments();
       if (message._index === undefined || !comments || !this.messages) {
         return [];
@@ -271,8 +274,13 @@
      * more visible messages in the list.
      */
     _getDelta(visibleMessages, messages, hideAutomated) {
+      if ([visibleMessages, messages].some(arg => arg === undefined)) {
+        return 0;
+      }
+
       let delta = MESSAGES_INCREMENT;
       const msgsRemaining = messages.length - visibleMessages.length;
+
       if (hideAutomated) {
         let counter = 0;
         let i;
@@ -289,6 +297,10 @@
      * exist in _visibleMessages.
      */
     _numRemaining(visibleMessages, messages, hideAutomated) {
+      if ([visibleMessages, messages].some(arg => arg === undefined)) {
+        return 0;
+      }
+
       if (hideAutomated) {
         return this._getHumanMessages(messages).length -
             this._getHumanMessages(visibleMessages).length;
@@ -311,6 +323,10 @@
 
     _computeShowHideTextHidden(visibleMessages, messages,
         hideAutomated) {
+      if ([visibleMessages, messages].some(arg => arg === undefined)) {
+        return 0;
+      }
+
       if (hideAutomated) {
         messages = this._getHumanMessages(messages);
         visibleMessages = this._getHumanMessages(visibleMessages);
@@ -334,7 +350,9 @@
     },
 
     _processedMessagesChanged(messages) {
-      this._visibleMessages = messages.slice(-MAX_INITIAL_SHOWN_MESSAGES);
+      if (messages) {
+        this._visibleMessages = messages.slice(-MAX_INITIAL_SHOWN_MESSAGES);
+      }
     },
 
     _computeNumMessagesText(visibleMessages, messages,

polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.js

@@ -208,6 +208,9 @@
 
     _computeChangeContainerClass(currentChange, relatedChange) {
       const classes = ['changeContainer'];
+      if ([relatedChange, currentChange].some(arg => arg === undefined)) {
+        return classes;
+      }
       if (this._changesEqual(relatedChange, currentChange)) {
         classes.push('thisChange');
       }
@@ -242,6 +245,9 @@
      * @return {number}
      */
     _getChangeNumber(change) {
+      // Default to 0 if change property is not defined.
+      if (!change) return 0;
+
       if (change.hasOwnProperty('_change_number')) {
         return change._change_number;
       }

polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.js

@@ -891,6 +891,7 @@
      * than SYNTAX_MAX_LINE_LENGTH.
      */
     _anyLineTooLong(diff) {
+      if (!diff) return false;
       return diff.content.some(section => {
         const lines = section.ab ?
               section.ab :

polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.js

@@ -265,7 +265,8 @@
 
     _getFiles(changeNum, patchRangeRecord) {
       // Polymer 2: check for undefined
-      if ([changeNum, patchRangeRecord].some(arg => arg === undefined)) {
+      if ([changeNum, patchRangeRecord, patchRangeRecord.base]
+          .some(arg => arg === undefined)) {
         return;
       }
 
@@ -745,6 +746,9 @@
     },
 
     _getDiffUrl(change, patchRange, path) {
+      if ([change, patchRange, path].some(arg => arg === undefined)) {
+        return '';
+      }
       return Gerrit.Nav.getUrlForDiff(change, path, patchRange.patchNum,
           patchRange.basePatchNum);
     },
@@ -783,6 +787,9 @@
     },
 
     _getChangePath(change, patchRange, revisions) {
+      if ([change, patchRange].some(arg => arg === undefined)) {
+        return '';
+      }
       const range = this._getChangeUrlRange(patchRange, revisions);
       return Gerrit.Nav.getUrlForChange(change, range.patchNum,
           range.basePatchNum);

polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js

@@ -967,6 +967,7 @@
      * @return {number}
      */
     getDiffLength(diff) {
+      if (!diff) return 0;
       return diff.content.reduce((sum, sec) => {
         if (sec.hasOwnProperty('ab')) {
           return sum + sec.ab.length;

polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.js

@@ -393,7 +393,7 @@
     },
 
     _isNewEmailValid(newEmail) {
-      return newEmail.includes('@');
+      return newEmail && newEmail.includes('@');
     },
 
     _computeAddEmailButtonEnabled(newEmail, addingEmail) {

polygerrit-ui/app/elements/shared/gr-comment/gr-comment.js

@@ -354,7 +354,7 @@
 
     _computeSaveDisabled(draft, comment, resolved) {
       // If resolved state has changed and a msg exists, save should be enabled.
-      if (comment.unresolved === resolved && draft) {
+      if (!comment || comment.unresolved === resolved && draft) {
         return false;
       }
       return !draft || draft.trim() === '';

polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.js

@@ -38,7 +38,7 @@
      */
     _mapLabelInfo(labelInfo, account, changeLabelsRecord) {
       const result = [];
-      if (!labelInfo) { return result; }
+      if (!labelInfo || !account) { return result; }
       if (!labelInfo.values) {
         if (labelInfo.rejected || labelInfo.approved) {
           const ok = labelInfo.approved || !labelInfo.rejected;

polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text.js

@@ -61,6 +61,7 @@
      *     commentLink patterns
      */
     _contentOrConfigChanged(content, config) {
+      if (!Gerrit.Nav || !Gerrit.Nav.mapCommentlinks) return;
       config = Gerrit.Nav.mapCommentlinks(config);
       const output = Polymer.dom(this.$.output);
       output.textContent = '';

polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text_test.html

@@ -314,26 +314,4 @@ limitations under the License.
       assert.isTrue(contentConfigStub.called);
     });
   });
-
-  suite('gr-linked-text with null config', () => {
-    let element;
-    let sandbox;
-
-    setup(() => {
-      element = fixture('basic');
-      sandbox = sinon.sandbox.create();
-    });
-
-    teardown(() => {
-      sandbox.restore();
-    });
-
-    test('_contentOrConfigChanged not called without config', () => {
-      const contentStub = sandbox.stub(element, '_contentChanged');
-      const contentConfigStub = sandbox.stub(element, '_contentOrConfigChanged');
-      element.content = 'some text';
-      assert.isTrue(contentStub.called);
-      assert.isFalse(contentConfigStub.called);
-    });
-  });
 </script>

polygerrit-ui/app/elements/shared/gr-linked-text/link-text-parser.js

@@ -228,9 +228,11 @@
    * @param {string} text
    */
   GrLinkTextParser.prototype.parse = function(text) {
-    linkify(text, {
+    if (text) {
-      callback: this.parseChunk.bind(this),
+      linkify(text, {
-    });
+        callback: this.parseChunk.bind(this),
+      });
+    }
   };
 
   /**