Fixes is_a() warning
Fixes is_a() warning

git-svn-id: 18c20fe3e6deba9861657632122c573e5ab50662@30034 ee427ae8-e902-0410-961c-c3ed070cd9f9

Symfony-Plugins/ahDoctrineEasyEmbeddedRelationsPlugin,Symfony-Plugins/ahDoctrineEasyEmbeddedRelationsPlugin