Py: replace BaseExceptionFreeCADError with more suitable exception types

src/App/GroupExtensionPyImp.cpp

@@ -50,7 +50,7 @@ PyObject*  GroupExtensionPy::newObject(PyObject *args)
         return object->getPyObject();
     }
     else {
-        PyErr_Format(Base::BaseExceptionFreeCADError, "Cannot create object of type '%s'", sType);
+        PyErr_Format(PyExc_TypeError, "Cannot create object of type '%s'", sType);
         return nullptr;
     }
 }