fixed page setting select all bug

app/controllers/admin/pages_controller.rb

@@ -21,6 +21,12 @@ class Admin::PagesController < Admin::ItemsController
   end
 
   def update
+    if params[:page][:category][0] == ""
+      params[:page][:category] = []
+    end
+    if params[:page][:tag][0] == ""
+      params[:page][:tag] = []
+    end
     @item = Page.find(params[:id])
     if @item.module_app && @item.module_app.key == 'page_content' && @item.page_contexts.blank?
       @item.page_contexts.build(:create_user_id => current_user.id, :update_user_id => current_user.id )