refactor: early out for polygon settings (which are unsupported) (CURA-1574)
refactor: early out for polygon settings (which are unsupported) (CURA-1574)

alephobjects/CuraEngine,totalretribution/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine,Ultimaker/CuraEngine,ROBO3D/CuraEngine,Ultimaker/CuraEngine,alephobjects/CuraEngine,totalretribution/CuraEngine