Playing an album from flac+cue files breaks notifications

[Diogo Lemos]

The error is because the file is trying to reach is not found:

ERROR:root:Uncaught exception
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/mutagen/_util.py", line 235, in _openfile
    fileobj = open(filename, "rb+" if writable else "rb")
FileNotFoundError: [Errno 2] No such file or directory: "cue:///Users/yyy/Music/08 A Collection Of Beatles Oldies (UK Mono)/The Beatles - A Collection Of Beatles Oldies (UK Mono).cue/8"

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/yyy/.cmus/cmus-osx/notify.py", line 97, in <module>
    file = File(status["file"])
  File "/usr/local/lib/python3.7/site-packages/mutagen/_util.py", line 147, in wrapper_func
    writable, create) as h:
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)
  File "/usr/local/lib/python3.7/site-packages/mutagen/_util.py", line 256, in _openfile
    raise MutagenError(e)
mutagen.MutagenError: [Errno 2] No such file or directory: "cue:///Users/yyy/Music/08 A Collection Of Beatles Oldies (UK Mono)/The Beatles - A Collection Of Beatles Oldies (UK Mono).cue/8"

It doesn't happen when playing flac files by themselves.

[Philip Trauner]

Added a conditional that should prevent the crash 🙂