fixes 0003804: FC becomes unusable after double-cicking on FEM elements while clip view is active

src/Gui/ViewProviderPythonFeature.cpp

@@ -453,6 +453,12 @@ ViewProviderPythonFeatureImp::setEdit(int ModNum)
         }
     }
     catch (Py::Exception&) {
+        // If a runtime error occurred when calling setEdit
+        // then handle it like returning false
+        if (PyErr_ExceptionMatches(PyExc_RuntimeError)) {
+            PyErr_Clear();
+            return Rejected;
+        }
         Base::PyException e; // extract the Python error text
         e.ReportException();
     }