bugfix: no return when GCodePlanner::makeRetractSwitchRetract reached end of all paths in gcode_layer
bugfix: no return when GCodePlanner::makeRetractSwitchRetract reached end of all paths in gcode_layer

ROBO3D/CuraEngine,mspark93/CuraEngine,pratikshashroff/pcura,fxtentacle/CuraEngine,Ultimaker/CuraEngine,pratikshashroff/pcura,totalretribution/CuraEngine,totalretribution/CuraEngine,alex1818/CuraEngine,uus169/CuraEngine,mspark93/CuraEngine,ROBO3D/CuraEngine,markwal/CuraEngine,alephobjects/CuraEngine,alephobjects/CuraEngine,patrick3coffee/CuraTinyG,pratikshashroff/pcura,patrick3coffee/CuraTinyG,patrick3coffee/CuraTinyG,ROBO3D/CuraEngine,totalretribution/CuraEngine,mspark93/CuraEngine,uus169/CuraEngine,alex1818/CuraEngine,alephobjects/CuraEngine,alex1818/CuraEngine,fxtentacle/CuraEngine,uus169/CuraEngine,markwal/CuraEngine,fxtentacle/CuraEngine,Ultimaker/CuraEngine,markwal/CuraEngine