using Traversable super class instead of Collection
using Traversable super class instead of Collection

ogizanagi/EasyAdminBundle,OskarStark/EasyAdminBundle,yceruto/EasyAdminBundle,javiereguiluz/EasyAdminBundle,OskarStark/EasyAdminBundle,ogizanagi/EasyAdminBundle,yceruto/EasyAdminBundle,ogizanagi/EasyAdminBundle,OskarStark/EasyAdminBundle,ogizanagi/EasyAdminBundle,yceruto/EasyAdminBundle,javiereguiluz/EasyAdminBundle