Return if audio is None in listener

[MatthewScholefield]

This is necessary because if the listener receives a stop signal, it returns None.

[LearnedVector]

LGTM

[forslund]

Looks sane, both Queue empty and None will result in the same outcome.

I see one issue I didn't see before. you need to specify timeout=0.5 in self.queue.get() (timeout is the second argument)

so it should be self.queue.get(timeout=0.5)

I had constant lockups when testing and this fixed it, it's a wonder that it have worked as well as it has.

[forslund]

Ok I'll send a PR with that change then

[LearnedVector]

oh shoot