'Fail silently when variable is a dict without the specified key.'

@setup({'list-index04': '{{    var.1    }}'})
def test_list_index04(self):

    output = self.engine.render_to_string('list-index04', {'var': {}})
    if self.engine.string_if_invalid:
        self.assertEqual(output, 'INVALID')
    else:
        self.assertEqual(output, '')
