Fix exception while creating a conversation

When confirming the creation of a one on one conversation with a new
contact, the first click would do nothing but the second click would
work. Now the first click works.

Fix by only reject new conversation creation if not saved.

// FREEBIE

js/panel_controller.js

@@ -60,8 +60,9 @@
                         saved.then(function() {
                             resolve(conversation);
                         }).fail(reject);
+                    } else {
+                        reject();
                     }
-                    reject();
                 });
             });
         },