Remove default bug tracker from _feedbackUrl

Bug: Issue 11216
Change-Id: I5cd33d8f74118a0e9b3c96a3bce949092181cc45

polygerrit-ui/app/elements/gr-app.html

@@ -221,7 +221,9 @@ limitations under the License.
       <div>
         <a class="feedback"
             href$="[[_feedbackUrl]]"
-            rel="noopener" target="_blank">Send feedback</a>
+            rel="noopener"
+            target="_blank"
+            hidden$="[[!_showFeedbackUrl(_feedbackUrl)]]">Send feedback</a>
         <template is="dom-if" if="[[_computeShowGwtUiLink(_serverConfig)]]">
           |
           <a id="gwtLink" href$="[[computeGwtUrl(_path)]]" rel="external">Switch to Old UI</a>

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

@@ -85,11 +85,7 @@
         computed: '_computePluginScreenName(params)',
       },
       _settingsUrl: String,
-      _feedbackUrl: {
-        type: String,
-        value: 'https://bugs.chromium.org/p/gerrit/issues/entry' +
-          '?template=PolyGerrit%20Issue',
-      },
+      _feedbackUrl: String,
     },
 
     listeners: {
@@ -467,5 +463,13 @@
       this.$.reporting.reportRpcTiming(e.detail.anonymizedUrl,
           e.detail.elapsed);
     },
+
+    _showFeedbackUrl(feedbackUrl) {
+      if (feedbackUrl) {
+        return feedbackUrl;
+      }
+
+      return false;
+    },
   });
 })();