don't create unneeded second body if part is created
don't create unneeded second body if part is created

usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI,usakhelo/FreeCAD,timthelion/FreeCAD,usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI,wood-galaxy/FreeCAD,wood-galaxy/FreeCAD,maurerpe/FreeCAD,chrisjaquet/FreeCAD,maurerpe/FreeCAD,wood-galaxy/FreeCAD,bblacey/FreeCAD-MacOS-CI,maurerpe/FreeCAD,usakhelo/FreeCAD,maurerpe/FreeCAD,Fat-Zer/FreeCAD_sf_master,bblacey/FreeCAD-MacOS-CI,Fat-Zer/FreeCAD_sf_master,timthelion/FreeCAD,Fat-Zer/FreeCAD_sf_master,bblacey/FreeCAD-MacOS-CI,wood-galaxy/FreeCAD,usakhelo/FreeCAD,wood-galaxy/FreeCAD,wood-galaxy/FreeCAD,timthelion/FreeCAD,maurerpe/FreeCAD,chrisjaquet/FreeCAD,usakhelo/FreeCAD,timthelion/FreeCAD,Fat-Zer/FreeCAD_sf_master,bblacey/FreeCAD-MacOS-CI,bblacey/FreeCAD-MacOS-CI,Fat-Zer/FreeCAD_sf_master,chrisjaquet/FreeCAD,timthelion/FreeCAD,usakhelo/FreeCAD,chrisjaquet/FreeCAD,timthelion/FreeCAD,chrisjaquet/FreeCAD,chrisjaquet/FreeCAD,chrisjaquet/FreeCAD