bugfix: timeEstimate recalculate trapezoids failed
bugfix: timeEstimate recalculate trapezoids failed

markwal/CuraEngine,pratikshashroff/pcura,pratikshashroff/pcura,alephobjects/CuraEngine,totalretribution/CuraEngine,Ultimaker/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine,alephobjects/CuraEngine,markwal/CuraEngine,alephobjects/CuraEngine,totalretribution/CuraEngine,pratikshashroff/pcura,Ultimaker/CuraEngine,ROBO3D/CuraEngine,markwal/CuraEngine,ROBO3D/CuraEngine