corrected an issue with setting css display property to an invalid value
corrected an issue with setting css display property to an invalid value

git-svn-id: a12887034337be3812df6d060455f26cce89a7aa@18243 ee427ae8-e902-0410-961c-c3ed070cd9f9

Symfony-Plugins/sfSympalPlugin,Symfony-Plugins/sfSympalPlugin