fix some unhandled promises and refactor some code

src/controllers/dashboard/dashboard.js

@@ -102,9 +102,9 @@ import confirm from '../../components/confirm/confirm';
                     case 'sendmessage':
                         showSendMessageForm(btn, session);
                         break;
-
                     case 'transcodinginfo':
                         showPlaybackInfo(btn, session);
+                        break;
                 }
             });
         });