Fix crash with empty track #40
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When a track hasn't loaded a file the `m_transportSource` won't contain a source and thus crashes on some interactions (but not on others). Protect the calls by first checking whether an audio file was loaded. Also call the *playing state changed* callback since the caller assumes the change actually changed so it needs to be "reset" for the UI to match the actual behavior.
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When a track hasn't loaded a file the
m_transportSourcewon't contain a source and thus crashes on some interactions (but not on others). Protect the calls by first checking whether an audio file was loaded.Also call the playing state changed callback since the caller assumes the change actually changed so it needs to be "reset" for the UI to match the actual behavior.