////
// Standard Tab Controller with: 
//   Save model on exit
//   Status property associated model
//   Model save actions
//
App.StandardTabController = Em.ObjectController.extend(App.ControllerObjectSaveMixin, App.ControllerObjectStatusMixin, App.SaveOnExitMixin, {
    hint: null
});
@@ -266,23 +266,8 @@
 n, %7B
-%0A    hint: null%0A
 %7D);
+%0A

Update controllers.js