fix: don't drop on buildplate when there's support under the model (CURA-1571)
fix: don't drop on buildplate when there's support under the model (CURA-1571)

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