fix: PolygonUtils::findClose etc functions are now safe wrt ClosePolygonPoints which are not found (CURA-1506)
fix: PolygonUtils::findClose etc functions are now safe wrt ClosePolygonPoints which are not found (CURA-1506)

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