Hide mentions of bubble timeline if empty

src/components/about/about.js

@@ -20,6 +20,9 @@ const About = {
       return this.$store.state.instance.showInstanceSpecificPanel &&
         !this.$store.getters.mergedConfig.hideISP &&
         this.$store.state.instance.instanceSpecificPanelContent
+    },
+    showLocalBubblePanel () {
+      return this.$store.state.instance.localBubbleInstances.length > 0
     }
   }
 }

src/components/about/about.vue

@@ -3,7 +3,7 @@
     <instance-specific-panel v-if="showInstanceSpecificPanel" />
     <staff-panel />
     <terms-of-service-panel />
-    <LocalBubblePanel />
+    <LocalBubblePanel v-if="showLocalBubblePanel" />
     <MRFTransparencyPanel />
     <features-panel v-if="showFeaturesPanel" />
   </div>