Add additional check to avoid unnecessary loading of polyfill
Add additional check to avoid unnecessary loading of polyfill

peter-gribanov/SonataAdminBundle,jordisala1991/SonataAdminBundle,dmarkowicz/SonataAdminBundle,Armstrong1992/SonataAdminBundle,sonata-project/SonataAdminBundle,greg0ire/SonataAdminBundle,mweimerskirch/SonataAdminBundle,dmarkowicz/SonataAdminBundle,OskarStark/SonataAdminBundle,greg0ire/SonataAdminBundle,dmarkowicz/SonataAdminBundle,osavchenko/SonataAdminBundle,greg0ire/SonataAdminBundle,ARTACK/SonataAdminBundle,ARTACK/SonataAdminBundle,Armstrong1992/SonataAdminBundle,jordisala1991/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,greg0ire/SonataAdminBundle,mweimerskirch/SonataAdminBundle,ossinkine/SonataAdminBundle,sonata-project/SonataAdminBundle,osavchenko/SonataAdminBundle,ossinkine/SonataAdminBundle,OskarStark/SonataAdminBundle,ossinkine/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,osavchenko/SonataAdminBundle,mweimerskirch/SonataAdminBundle,osavchenko/SonataAdminBundle,ARTACK/SonataAdminBundle,peter-gribanov/SonataAdminBundle,OskarStark/SonataAdminBundle,jordisala1991/SonataAdminBundle,osavchenko/SonataAdminBundle,dmarkowicz/SonataAdminBundle,jordisala1991/SonataAdminBundle,peter-gribanov/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,OskarStark/SonataAdminBundle,ARTACK/SonataAdminBundle,mweimerskirch/SonataAdminBundle,ossinkine/SonataAdminBundle,dmarkowicz/SonataAdminBundle,peter-gribanov/SonataAdminBundle