fixed selection of centerpoints when only selecting them resulted in not selecting anything at all (in Sketcher touch-selection)
fixed selection of centerpoints when only selecting them resulted in not
selecting anything at all (in Sketcher touch-selection)

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