Fixed some UI issues

Fixed: Add folder won't show loading when there aren't any folders

src/UI/AddSeries/AddSeriesLayout.js

@@ -37,7 +37,10 @@ define(
 
             initialize: function () {
                 QualityProfileCollection.fetch();
-                RootFolderCollection.fetch();
+                RootFolderCollection.fetch()
+                    .done(function () {
+                        RootFolderCollection.synced = true;
+                    });
             },
 
             onShow: function () {

src/UI/AddSeries/RootFolders/Layout.js

@@ -37,7 +37,7 @@ define(
             onRender: function () {
                 this.currentDirs.show(new LoadingView());
 
-                if (RootFolderCollection.any()) {
+                if (RootFolderCollection.synced) {
                     this._showCurrentDirs();
                 }
 

src/UI/Commands/CommandController.js

@@ -43,7 +43,7 @@ define(
                         }
                     });
 
-                    CommandCollection.bind('add sync', function () {
+                    CommandCollection.bind('sync', function () {
                         var command = CommandCollection.findCommand(options.command);
                         if (command) {
                             self._bindToCommandModel.call(self, command, options);