[Draft] ImportDXF Bug upgrading from 0.16
[Draft] ImportDXF Bug upgrading from 0.16

See discussion https://forum.freecadweb.org/viewtopic.php?f=3&t=41879
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