test_async_recognize_local_file() is flaky

[dhermes]

See: https://circleci.com/gh/GoogleCloudPlatform/google-cloud-python/1781

Failed line assumes operation.results will be a list, but instead it is None.

[lukesneeringer]

Since this ticket was filed, we have released a new Speech library which entails effectively a complete rewrite. Since it is very likely to solve this issue, I am closing this. However, please feel free to reopen if my closure is premature.

Note: Make sure you are using google.cloud.speech.SpeechClient, as the old Client still exists as a deprecated artifact for a little longer.