Null-check on the widget list before accessing it
Null-check on the widget list before accessing it

agirault/VesselView,matthieuheitz/VesselView,matthieuheitz/VesselView,KitwareMedical/VesselView,KitwareMedical/VesselView,sumedhasingla/VesselView,sumedhasingla/VesselView,sumedhasingla/VesselView,agirault/VesselView,KitwareMedical/VesselView,agirault/VesselView,matthieuheitz/VesselView