Add check for nil parents in collection deletion
Add check for nil parents in collection deletion

yonglehou/facette,yonglehou/facette,hirocaster/facette,facette/facette,facette/facette,vovkasm/facette,facette/facette,vovkasm/facette,yonglehou/facette,facette/facette,hirocaster/facette,vovkasm/facette,hirocaster/facette