handle empty persitent parameters
handle empty persitent parameters

Th3Mouk/SonataAdminBundle,jakublech/SonataAdminBundle,Romashka/SonataAdminBundle,Koc/SonataAdminBundle,j-ledoux/SonataAdminBundle,fosvn/SonataAdminBundle,mikemeier/SonataAdminBundle,gRoussac/SonataAdminBundle,vincenttouzet/SonataAdminBundle,jordisala1991/SonataAdminBundle,ellementA/SonataAdminBundle,tim96/SonataAdminBundle,idchlife/SonataAdminBundle,osavchenko/SonataAdminBundle,0mars/SonataAdminBundle,ellementA/SonataAdminBundle,rswork/SonataAdminBundle,edouardkombo/SonataAdminBundle,osavchenko/SonataAdminBundle,morgangiraud/SonataAdminBundle,ossinkine/SonataAdminBundle,rschumacher/SonataAdminBundle,Koc/SonataAdminBundle,goldbroker/SonataAdminBundle,goldbroker/SonataAdminBundle,peter-gribanov/SonataAdminBundle,rmzamora/SonataAdminBundle,lutangar/SonataAdminBundle,news-life-media/SonataAdminBundle,robhunt3r/SonataAdminBundle,mgdigital/SonataAdminBundle,ossinkine/SonataAdminBundle,jszmidt/SonataAdminBundle,arbislimen/SonataAdminBundle,goldbroker/SonataAdminBundle,morgangiraud/SonataAdminBundle,jlamur/SonataAdminBundle,mikemeier/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,gRoussac/SonataAdminBundle,jakublech/SonataAdminBundle,ksom/SonataAdminBundle,nexylan/SonataAdminBundle,mgdigital/SonataAdminBundle,ruscon/SonataAdminBundle,rmzamora/SonataAdminBundle,jordisala1991/SonataAdminBundle,osavchenko/SonataAdminBundle,goldbroker/SonataAdminBundle,mohebifar/SonataAdminBundle,arbislimen/SonataAdminBundle,morfin60/SonataAdminBundle,sonata-project/SonataAdminBundle,robhunt3r/SonataAdminBundle,mweimerskirch/SonataAdminBundle,digitalkaoz/SonataAdminBundle,gRoussac/SonataAdminBundle,vincenttouzet/SonataAdminBundle,mikemeier/SonataAdminBundle,lightglitch/SonataAdminBundle,Storke/SonataAdminBundle,andythorne/SonataAdminBundle,Th3Mouk/SonataAdminBundle,lutangar/SonataAdminBundle,mweimerskirch/SonataAdminBundle,amine2z/SonataAdminBundle,Th3Mouk/SonataAdminBundle,ksom/SonataAdminBundle,ryanhughes/SonataAdminBundle,Romashka/SonataAdminBundle,ruscon/SonataAdminBundle,claudusd/SonataAdminBundle,dankempster/SonataAdminBundle,joshlopes/SonataAdminBundle,lightglitch/SonataAdminBundle,Storke/SonataAdminBundle,greg0ire/SonataAdminBundle,qsomazzi/SonataAdminBundle,morfin60/SonataAdminBundle,ju1ius/SonataAdminBundle,digitalkaoz/SonataAdminBundle,morgangiraud/SonataAdminBundle,UnDeleteRU/SonataAdminBundle,Denniskevin/SonataAdminBundle,greg0ire/SonataAdminBundle,morfin60/SonataAdminBundle,edouardkombo/SonataAdminBundle,Armstrong1992/SonataAdminBundle,cmacetko/SonataAdminBundle,binhle410/SonataAdminBundle,jakublech/SonataAdminBundle,FabienD/SonataAdminBundle,Armstrong1992/SonataAdminBundle,tim96/SonataAdminBundle,ksom/SonataAdminBundle,greg0ire/SonataAdminBundle,core23/SonataAdminBundle,sonata-project/SonataAdminBundle,ju1ius/SonataAdminBundle,UnDeleteRU/SonataAdminBundle,ejkun/SonataAdminBundle,rswork/SonataAdminBundle,greg0ire/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,ryanhughes/SonataAdminBundle,amine2z/SonataAdminBundle,edouardkombo/SonataAdminBundle,news-life-media/SonataAdminBundle,andythorne/SonataAdminBundle,nexylan/SonataAdminBundle,cmacetko/SonataAdminBundle,dmarkowicz/SonataAdminBundle,claudusd/SonataAdminBundle,tunne/SonataAdminBundle,Romashka/SonataAdminBundle,core23/SonataAdminBundle,gnorby88/SonataAdminBundle,cmacetko/SonataAdminBundle,peter-gribanov/SonataAdminBundle,nexylan/SonataAdminBundle,dankempster/SonataAdminBundle,jordisala1991/SonataAdminBundle,tim96/SonataAdminBundle,qsomazzi/SonataAdminBundle,Storke/SonataAdminBundle,jlamur/SonataAdminBundle,gnorby88/SonataAdminBundle,j-ledoux/SonataAdminBundle,fosvn/SonataAdminBundle,claudusd/SonataAdminBundle,OskarStark/SonataAdminBundle,tskorupka/SonataAdminBundle,mohebifar/SonataAdminBundle,tskorupka/SonataAdminBundle,Denniskevin/SonataAdminBundle,UnDeleteRU/SonataAdminBundle,rmzamora/SonataAdminBundle,ossinkine/SonataAdminBundle,andythorne/SonataAdminBundle,Th3Mouk/SonataAdminBundle,FabienD/SonataAdminBundle,fosvn/SonataAdminBundle,qsomazzi/SonataAdminBundle,FabienD/SonataAdminBundle,nexylan/SonataAdminBundle,binhle410/SonataAdminBundle,joshlopes/SonataAdminBundle,news-life-media/SonataAdminBundle,rmzamora/SonataAdminBundle,dmarkowicz/SonataAdminBundle,cmacetko/SonataAdminBundle,jszmidt/SonataAdminBundle,morgangiraud/SonataAdminBundle,core23/SonataAdminBundle,Soullivaneuh/SonataAdminBundle,core23/SonataAdminBundle,rswork/SonataAdminBundle,jlamur/SonataAdminBundle,ju1ius/SonataAdminBundle,osavchenko/SonataAdminBundle,ellementA/SonataAdminBundle,tskorupka/SonataAdminBundle,dankempster/SonataAdminBundle,UnDeleteRU/SonataAdminBundle,j-ledoux/SonataAdminBundle,vincenttouzet/SonataAdminBundle,Koc/SonataAdminBundle,qsomazzi/SonataAdminBundle,tunne/SonataAdminBundle,dmarkowicz/SonataAdminBundle,FabienD/SonataAdminBundle,tskorupka/SonataAdminBundle,ksom/SonataAdminBundle,mohebifar/SonataAdminBundle,ossinkine/SonataAdminBundle,binhle410/SonataAdminBundle,tunne/SonataAdminBundle,dmarkowicz/SonataAdminBundle,news-life-media/SonataAdminBundle,OskarStark/SonataAdminBundle,ARTAC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