Added check if sortable variable is defined in form_admin_fields.html.twig
Added check if sortable variable is defined in form_admin_fields.html.twig

This fixes edge case if someone is using overloaded choice type in his project without changes in template.
edouardkombo/SonataAdminBundle,Koc/SonataAdminBundle,jakublech/SonataAdminBundle,jordisala1991/SonataAdminBundle,vincenttouzet/SonataAdminBundle,cmacetko/SonataAdminBundle,digitalkaoz/SonataAdminBundle,ju1ius/SonataAdminBundle,sonata-project/SonataAdminBundle,osavchenko/SonataAdminBundle,digitalkaoz/SonataAdminBundle,Storke/SonataAdminBundle,greg0ire/SonataAdminBundle,dmarkowicz/SonataAdminBundle,peter-gribanov/SonataAdminBundle,rswork/SonataAdminBundle,core23/SonataAdminBundle,mikemeier/SonataAdminBundle,mgdigital/SonataAdminBundle,core23/SonataAdminBundle,UnDeleteRU/SonataAdminBundle,mweimerskirch/SonataAdminBundle,rmzamora/SonataAdminBundle,mohebifar/SonataAdminBundle,nexylan/SonataAdminBundle,arbislimen/SonataAdminBundle,joshlopes/SonataAdminBundle,jordisala1991/SonataAdminBundle,idchlife/SonataAdminBundle,osavchenko/SonataAdminBundle,rswork/SonataAdminBundle,gnorby88/SonataAdminBundle,andythorne/SonataAdminBundle,news-life-media/SonataAdminBundle,UnDeleteRU/SonataAdminBundle,lightglitch/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,cmacetko/SonataAdminBundle,rschumacher/SonataAdminBundle,j-ledoux/SonataAdminBundle,tunne/SonataAdminBundle,dankempster/SonataAdminBundle,j-ledoux/SonataAdminBundle,jszmidt/SonataAdminBundle,osavchenko/SonataAdminBundle,fosvn/SonataAdminBundle,andythorne/SonataAdminBundle,jakublech/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,ju1ius/SonataAdminBundle,edouardkombo/SonataAdminBundle,fosvn/SonataAdminBundle,tskorupka/SonataAdminBundle,Storke/SonataAdminBundle,cmacetko/SonataAdminBundle,ruscon/SonataAdminBundle,claudusd/SonataAdminBundle,robhunt3r/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,ellementA/SonataAdminBundle,amine2z/SonataAdminBundle,arbislimen/SonataAdminBundle,ryanhughes/SonataAdminBundle,Armstrong1992/SonataAdminBundle,Armstrong1992/SonataAdminBundle,jakublech/SonataAdminBundle,morgangiraud/SonataAdminBundle,tunne/SonataAdminBundle,lightglitch/SonataAdminBundle,ryanhughes/SonataAdminBundle,lightglitch/SonataAdminBundle,robhunt3r/SonataAdminBundle,mgdigital/SonataAdminBundle,Denniskevin/SonataAdminBundle,morfin60/SonataAdminBundle,jszmidt/SonataAdminBundle,dankempster/SonataAdminBundle,ksom/SonataAdminBundle,cmacetko/SonataAdminBundle,digitalkaoz/SonataAdminBundle,morfin60/SonataAdminBundle,news-life-media/SonataAdminBundle,Denniskevin/SonataAdminBundle,ARTACK/SonataAdminBundle,gnorby88/SonataAdminBundle,peter-gribanov/SonataAdminBundle,Th3Mouk/SonataAdminBundle,mikemeier/SonataAdminBundle,rschumacher/SonataAdminBundle,amine2z/SonataAdminBundle,dmarkowicz/SonataAdminBundle,idchlife/SonataAdminBundle,morgangiraud/SonataAdminBundle,lutangar/SonataAdminBundle,tim96/SonataAdminBundle,osavchenko/SonataAdminBundle,ellementA/SonataAdminBundle,ellementA/SonataAdminBundle,lightglitch/SonataAdminBundle,0mars/SonataAdminBundle,ruscon/SonataAdminBundle,morfin60/SonataAdminBundle,j-ledoux/SonataAdminBundle,tunne/SonataAdminBundle,mohebifar/SonataAdminBundle,0mars/SonataAdminBundle,Romashka/SonataAdminBundle,Th3Mouk/SonataAdminBundle,rswork/SonataAdminBundle,mikemeier/SonataAdminBundle,UnDeleteRU/SonataAdminBundle,news-life-media/SonataAdminBundle,claudusd/SonataAdminBundle,jlamur/SonataAdminBundle,lutangar/SonataAdminBundle,Romashka/SonataAdminBundle,gnorby88/SonataAdminBundle,core23/SonataAdminBundle,qsomazzi/SonataAdminBundle,goldbroker/SonataAdminBundle,sonata-project/SonataAdminBundle,ejkun/SonataAdminBundle,gRoussac/SonataAdminBundle,ryanhughes/SonataAdminBundle,andythorne/SonataAdminBundle,Romashka/SonataAdminBundle,joshlopes/SonataAdminBundle,UnDeleteRU/SonataAdminBundle,greg0ire/SonataAdminBundle,dmarkowicz/SonataAdminBundle,jlamur/SonataAdminBundle,mohebifar/SonataAdminBundle,andythorne/SonataAdminBundle,nexylan/SonataAdminBundle,tskorupka/SonataAdminBundle,osavchenko/SonataAdminBundle,ellementA/SonataAdminBundle,tim96/SonataAdminBundle,rmzamora/SonataAdminBundle,mweimerskirch/SonataAdminBundle,tskorupka/SonataAdminBundle,idchlife/SonataAdminBundle,gnorby88/SonataAdminBundle,FabienD/SonataAdminBundle,mohebifar/SonataAdminBundle,Denniskevin/SonataAdminBundle,tunne/SonataAdminBundle,goldbroker/SonataAdminBundle,joshlopes/SonataAdminBundle,morgangiraud/SonataAdminBundle,ju1ius/SonataAdminBundle,lutangar/SonataAdminBundle,0mars/SonataAdminBundle,rmzamora/SonataAdminBundle,Storke/SonataAdminBundle,jszmidt/SonataAdminBundle,amine2z/SonataAdminBundle,goldbroker/SonataAdminBundle,Th3Mouk/SonataAdminBundle,UnDeleteRU/SonataAdminBundle,Denniskevin/SonataAdminBundle,FabienD/SonataAdminBundle,dankempster/SonataAdminBundle,ejkun/SonataAdminBundle,arbislimen/SonataAdminBundle,ellementA/SonataAdminBundle,fosvn/SonataAdminBundle,morfin60/SonataAdminBundle,greg0ire/SonataAdminBundle,jordisala1991/SonataAdminBundle,news-life-media/SonataAdminBundle,ksom/SonataAdminBundle,mgdigital/SonataAdminBundle,morfin60/SonataAdminBundle,news-life-media/SonataAdminBundle,peter-gribanov/SonataAdminBundle,OskarStark/SonataAdminBundle,Th3Mouk/SonataAdminBundle,ossinkine/SonataAdminBundle,ossinkine/SonataAdminBundle,ARTACK/SonataAdminBundle,vincenttouzet/SonataAdminBundle,vincenttouzet/SonataAdminBundle,core23/SonataAdminBundle,vincenttouzet/SonataAdminBundle,ossinkine/SonataAdminBundle,amine2z/SonataAdminBundle,ejkun/SonataAdminBundle,ejkun/SonataAdminBundle,binhle410/SonataAdminBundle,jlamur/SonataAdminBundle,tim96/SonataAdminBundle,edouardkombo/SonataAdminBundle,Storke/SonataAdminBundle,Romashka/SonataAdminBundle,FabienD/SonataAdminBundle,lutangar/SonataAdminBundle,jakublech/SonataAdminBundle,qsomazzi/SonataAdminBundle,j-ledoux/SonataAdminBundle,qsomazzi/SonataAdminBundle,gRoussac/SonataAdminBundle,Koc/SonataAdminBundle,qsomazzi/SonataAdminBundle,greg0ire/SonataAdminBundle,Romashka/SonataAdminBundle,peter-gribanov/SonataAdminBundle,ARTACK/SonataAdminBundle,mikemeier/SonataAdminBundle,ksom/SonataAdminBundle,mweimerskirch/SonataAdminBundle,binhle410/SonataAdminBundle,ARTACK/SonataAdminBundle,j-ledoux/SonataAdminBundle,Koc/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,mweimerskirch/SonataAdminBundle,idchlife/SonataAdminBundle,ruscon/SonataAdminBundle,goldbroker/SonataAdminBundle,rschumacher/SonataAdminBundle,OskarStark/SonataAdminBundle,rschumacher/SonataAdminBundle,OskarStark/SonataAdminBundle,robhunt3r/SonataAdminBundle,jordisala1991/SonataAdminBundle,claudusd/SonataAdminBundle,arbislimen/SonataAdminBundle,claudusd/SonataAdminBundle,0mars/SonataAdminBundle,binhle410/SonataAdminBundle,fosvn/SonataAdminBundle,gRoussac/SonataAdminBundle,ksom/SonataAdminBundle,ju1ius/SonataAdminBundle,robhunt3r/SonataAdminBundle,gRoussac/SonataAdminBundle,mgdigital/SonataAdminBundle,FabienD/SonataAdminBundle,dmarkowicz/SonataAdminBundle,binhle410/SonataAdminBundle,nexylan/SonataAdminBundle,OskarStark/SonataAdminBundle,rswork/SonataAdminBundle,jlamur/SonataAdminBundle,morgangiraud/SonataAdminBundle,Koc/SonataAdminBundle,dankempster/SonataAdminBundle,digitalkaoz/SonataAdminBundle,dmarkowicz/SonataAdminBundle,tskorupka/SonataAdminBundle,ejkun/SonataAdminBundle,tim96/SonataAdminBundle,jlamur/SonataAdminBundle,ruscon/SonataAdminBundle,joshlopes/SonataAdminBundle,binhle410/SonataAdminBundle,jszmidt/SonataAdminBundle,rmzamora/SonataAdminBundle,ossinkine/SonataAdminBundle,edouardkombo/SonataAdminBundle,ryanhughes/SonataAdminBundle,nexylan/SonataAdminBundle