'Make sure that we can pass in an empty matching_metadata.'

def test_no_matching_metadata(self):

    t = template_format.parse(alarm_template)
    properties = t['Resources']['MEMAlarmHigh']['Properties']
    properties['alarm_actions'] = ['signal_handler']
    del properties['matching_metadata']
    test_stack = self.create_stack(template=json.dumps(t))
    test_stack.create()
    rsrc = test_stack['MEMAlarmHigh']
    self.assertEqual((rsrc.CREATE, rsrc.COMPLETE), rsrc.state)
    self.assertIsNone(rsrc.validate())
