Don't display if we don't have a chat.

src/components/chat/chat.vue

@@ -7,7 +7,7 @@
     </div>
     <div class="panel-body base01-background">
       <div class="chat-window">
-        <div class="chat-message" v-for="message in messages">
+        <div class="chat-message" v-for="message in messages" :key="message.id">
           <span class="chat-avatar">
             <img :src="message.author.avatar" />
             {{message.author.username}}:

src/components/nav_panel/nav_panel.js

@@ -2,6 +2,9 @@ const NavPanel = {
   computed: {
     currentUser () {
       return this.$store.state.users.currentUser
+    },
+    chat () {
+      return this.$store.state.chat.channel
     }
   }
 }

src/components/nav_panel/nav_panel.vue

@@ -7,7 +7,7 @@
             {{ $t("nav.timeline") }}
           </router-link>
         </li>
-        <li v-if='currentUser'>
+        <li v-if='chat && currentUser'>
           <router-link class="base00-background" to='/chat'>
             {{ $t("nav.chat") }}
           </router-link>