Fixed Python unit test

aidge_core/unit_tests/test_operator_binding.py

@@ -120,7 +120,7 @@ class test_operator_binding(unittest.TestCase):
         generic_op = generic_node.get_operator()
         customImpl = PythonCustomImpl(generic_op)
 
-        generic_op.forward() # Do nothing, no implementation set
+        #generic_op.forward() # Throw an error, no implementation set
         generic_op.set_impl(customImpl)
         generic_op.forward() # Increment idx
         self.assertEqual(customImpl.idx, 1)