Remove default bug tracker from _feedbackUrl

Bug: Issue 11216
Change-Id: I5cd33d8f74118a0e9b3c96a3bce949092181cc45

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

@@ -196,7 +196,9 @@ limitations under the License.
       <div>
         <a class="feedback"
             href$="[[_feedbackUrl]]"
-            rel="noopener" target="_blank">Report bug</a>
+            rel="noopener"
+            target="_blank"
+            hidden$="[[!_showFeedbackUrl(_feedbackUrl)]]">Report bug</a>
         | Press &ldquo;?&rdquo; for keyboard shortcuts
         <gr-endpoint-decorator name="footer-right"></gr-endpoint-decorator>
       </div>

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

@@ -78,11 +78,7 @@
         computed: '_computePluginScreenName(params)',
       },
       _settingsUrl: String,
-      _feedbackUrl: {
-        type: String,
-        value: 'https://bugs.chromium.org/p/gerrit/issues/entry' +
-          '?template=PolyGerrit%20Issue',
-      },
+      _feedbackUrl: String,
       // Used to allow searching on mobile
       mobileSearch: {
         type: Boolean,
@@ -441,5 +437,13 @@
     _mobileSearchToggle(e) {
       this.mobileSearch = !this.mobileSearch;
     },
+
+    _showFeedbackUrl(feedbackUrl) {
+      if (feedbackUrl) {
+        return feedbackUrl;
+      }
+
+      return false;
+    },
   });
 })();