Small bug fix - don't exit the loop that mops up the remaining insets if a level is empty.
Small bug fix - don't exit the loop that mops up the remaining insets if a level is empty.

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