Added useAvailableFields which checks if the widget exists before trying to use it
Added useAvailableFields which checks if the widget exists before trying to use it



git-svn-id: 916ad0461be1e0373a0f1564a3f7a0e6fdd3ab8c@29758 ee427ae8-e902-0410-961c-c3ed070cd9f9

Symfony-Plugins/sfTrafficCMSPlugin,Symfony-Plugins/sfTrafficCMSPlugin