fix(validators): don't require any specific renditions on output
fix(validators): don't require any specific renditions on output

those must match picture crop vocabularies, which is now empty
by default, so it would be quite hard to set it up properly.

superdesk/superdesk-core,hlmnrmr/superdesk-core,superdesk/superdesk-core,marwoodandrew/superdesk-core,ioanpocol/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core,nistormihai/superdesk-core,nistormihai/superdesk-core,mugurrus/superdesk-core,hlmnrmr/superdesk-core,petrjasek/superdesk-core,mdhaman/superdesk-core,mdhaman/superdesk-core,ioanpocol/superdesk-core,petrjasek/superdesk-core,marwoodandrew/superdesk-core,ancafarcas/superdesk-core,mugurrus/superdesk-core,ancafarcas/superdesk-core,mugurrus/superdesk-core,ioanpocol/superdesk-core,petrjasek/superdesk-core,mdhaman/superdesk-core,superdesk/superdesk-core