Sketcher: Use transparent exception mechanism for fillets
Sketcher: Use transparent exception mechanism for fillets

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This ensures that the exception back in the c++ that invoked python retains the type of exception and can be properly catched.

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