Sketcher: Fix solver failure when setting datum results in wrong solver information
Sketcher: Fix solver failure when setting datum results in wrong solver information

===================================================================================

fixes:
https://forum.freecadweb.org/viewtopic.php?p=404945#p405014

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master