fix: don't output print temperature in starting code if set to zero (CURA-3101)
fix: don't output print temperature in starting code if set to zero (CURA-3101)

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