fix some chat errors/warnings that sometimes happen

src/components/chat_title/chat_title.vue

@@ -14,10 +14,11 @@
       />
     </router-link>
     <RichContent
+      v-if="user"
       class="username"
       :title="'@'+user.screen_name_ui"
       :html="htmlTitle"
-      :emoji="user.emoji"
+      :emoji="user.emoji || []"
     />
   </div>
 </template>