fix crash on datum point preselect It is unclear why the coordinates are NULL. This fix prevents the crash but does not fix the reason why this unnormality occurs.
fix crash on datum point preselect
It is unclear why the coordinates are NULL. This fix prevents the crash but does not fix the reason why this unnormality occurs.

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