'Config: add_extra_newznab should raise on None adding'

@TestArgs(None, [], [1, 2, 3], [True])
def test_add_extra_newznab_raise_on_none(self, initial):

    path = '/tmp/notexist'
    self.config_mock['Newznab'] = {'extra_newznabs': initial}
    c = headphones.config.Config(path)
    with self.assertRaises(TypeError):
        c.add_extra_newznab(None)
    pass
