Set aliases field to empty array for compatability with sf 1.3 and 1.2
Set aliases field to empty array for compatability with sf 1.3 and 1.2

git-svn-id: a862190330e4d0d14a897da8b04586a8f073f881@26526 ee427ae8-e902-0410-961c-c3ed070cd9f9

Symfony-Plugins/sfFlexymfonyPlugin,Symfony-Plugins/sfFlexymfonyPlugin