Fix a division by zero error, happens quite often during multilingual automated inference

[Mrw33554432]

fix an annoying bug (minor), happens quite often when running coquiTTS automatically
print(f" > Real-time factor: {process_time / audio_time}")
to
print(f" > Real-time factor: {process_time / audio_time if audio_time != 0 else 'undefined'}")
It will happen whenever the sentence split function produce empty string, or empty string is entered by accident, which cause audio_time=0

[CLAassistant]

All committers have signed the CLA.

[Mrw33554432]

Perhaps a better way is catch the whole stats code block with a try catch block. I am not sure if this is the only problem here (As most of errors I encountered happened outside the main TTS function).

[WeberJulian]

Hey, thanks for sending a PR. I think the real issue here is that no inference should happen with an empty string.
So a better fix would be to raise an error if the full input text is empty. Otherwise, we should remove the empty strings in sens for the resulting sens = self.split_into_sentences(text). Do you wanna make this change or should we do it?

[Mrw33554432]

Hey, thanks for sending a PR. I think the real issue here is that no inference should happen with an empty string.
So a better fix would be to raise an error if the full input text is empty. Otherwise, we should remove the empty strings in sens for the resulting sens = self.split_into_sentences(text). Do you wanna make this change or should we do it?

Unfortunately I am not familiar with the code you pointed out, so it will be nice if you can take a minute or two to fix it - it should be simple.
Additional, it will be really nice if there is a feature that changes errors from unimportant code blocks into warnings, without interrupting running program (especially when we are trying to deploy it, a logged warning is so much better than an error, as long as next function call can still work correctly) I might look into that in future days.

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