Sketcher: Remove errors in reporting view while deleting
Sketcher: Remove errors in reporting view while deleting

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fixes #2275

https://freecadweb.org/tracker/view.php?id=2275

Deletion of coincidents rely on selected vertex. The original code was trying to delete a coincident without checking whether one was there.

The implementation now relies on checking whether a coincident is present.

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