Add fault tolerance mechanism

[Tom]

Thank you for publishing the model.
In pypi's package, when the audio model can't turn notes, the program will report an error. Instead of outputting an empty midi. The wrong place is in line 397 of piano_transcription_inference/utilities.py.
And there are some audio models that can't be identified.

[qiuqiangkong]

Thanks for reporting the issue!