Fix these bugs:

1.結構部份
    a.原選單，點選編輯，無動作反應
    b.新增選單後，左邊灰色架構部份不會更新

  2.檔案室
    a.無法編輯分類

app/controllers/admin/links_controller.rb

@@ -1,10 +1,4 @@
-class Admin::LinksController < ApplicationController
-
-  layout "site_editor"
-  
-  before_filter :authenticate_user!
-  before_filter :find_parent_item
-  before_filter :is_admin?
+class Admin::LinksController < Admin::ItemsController
   
   def show
     @item ||= Link.find(params[:id])

app/controllers/admin/pages_controller.rb

@@ -1,11 +1,4 @@
-class Admin::PagesController < ApplicationController
-
-  layout "site_editor"
-  
-  before_filter :authenticate_user!
-  before_filter :find_parent_item
-  before_filter :is_admin?
-  before_filter :set_current_item
+class Admin::PagesController < Admin::ItemsController
   
   def show
     @item = Page.find(params[:id])
@@ -40,7 +33,7 @@ class Admin::PagesController < ApplicationController
 	
 	  @frontend_path = @item.app_frontend_url ? @item.app_frontend_url : @module_app.widgets.keys[0]
 	  
-	  if @module_app.widgets.any?{|b| b.class == Array}
+	  if @module_app && @module_app.widgets && @module_app.widgets.any?{|b| b.class == Array}
         @frontend_style =  @module_app.widgets[@frontend_path] if !@frontend_path.blank? && !@module_app.widgets.blank?
 	  end