Http error 429 raises av.error.UndefinedError

[Mr-Auto]

Tested with https://httpstatuses.maor.io/429

Test code https://gist.github.com/Mr-Auto/da1d7a9fdb76f64552ad33124688dea5

At the http error 429, av.open raises av.error.UndefinedError instead of the expected av.error.HTTPOtherClientError / av.error.HTTPClientError

Testing client code 429
Exception: <class 'av.error.UndefinedError'>
[Errno 959591672] Server returned 429 Too Many Requests: 'https://httpstatuses.maor.io/429'