fix exception when monitor is default pulseaudio device

bastibe / SoundCard

A Pure-Python Real-Time Audio Library

https://soundcard.readthedocs.io

BSD 3-Clause "New" or "Revised" License

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Closed ipelupessy closed 5 years ago

ipelupessy commented 5 years ago

this fixes #52, in the sense that it prevents an exception occuring. It may not be the desired behaviour though...

bastibe commented 5 years ago

Cool, thank you!