Added comment to test_query_clone indicating lack of assert is intentional.

        self.assertEqual(q1, q2)

    def test_query_clone(self):

        # Ticket #21643

        # Ticket #21643 - Crash when compiling query more than once

        qs = Experiment.objects.filter(end__lt=F('start') + datetime.timedelta(hours=1))

        qs2 = qs.all()

        list(qs)

        list(qs2)

        # Intentionally no assert

    def test_delta_add(self):

        for i in range(len(self.deltas)):