Infinite loop if there are no RtAudio accessible devices

[kwhite-uottawa]

If there are no available audio devices, then MySound::SetAudioDevice enters an infinite loop. I do sometimes use LoopAuditioneer on a VM without any sound to try some bulk operations.

https://github.com/GrandOrgue/LoopAuditioneer/blame/bbf77ee4467148f42b40e34958f587a90b63a256/src/MySound.cpp#L74

Perhaps something like this (untested):

  if (m_audio->getDeviceCount() > 0) SetAudioDevice(m_audio->getDefaultOutputDevice());

But even doing nothing works for me (tested):

  // SetAudioDevice(m_audio->getDefaultOutputDevice());

Season to taste.