Change AVAudio interruption and route change handlers to use guards #3
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Swift 100% newbie here, but this seems like the right "upgrade" to be more in line with current Swift semantics? If anything wrong here, I apologize.
Per:
https://developer.apple.com/library/content/documentation/Audio/Conceptual/AudioSessionProgrammingGuide/HandlingAudioInterruptions/HandlingAudioInterruptions.html