Mimic2 TTS fails on cached lines (.wavs play fine through paplay)

[ChanceNCounter]

For the past little while, I've been getting TTS failures on cached phrases. Here's an example from audio.log:

audio.log snippet

```python3 2021-03-28 21:35:08.852 | INFO | 270 | mycroft.audio.speech:mute_and_speak:127 | Speak: Seventeen Playing WAVE '/tmp/mycroft/cache/tts/Mimic2/00e86eb858795dc0bce0a673f3218e61.wav' : Signed 16 bit Little Endian, Rate 22000 Hz, Mono 2021-03-28 21:35:15.702 | INFO | 270 | mycroft.audio.speech:mute_and_speak:127 | Speak: Seventeen 2021-03-28 21:35:15.707 | INFO | 270 | mycroft.tts.tts:_get_sentence_from_cache:393 | Found 00e86eb858795dc0bce0a673f3218e61.wav in TTS cache 2021-03-28 21:35:15.710 | ERROR | 270 | mycroft.audio.speech:mute_and_speak:134 | TTS execution failed. Traceback (most recent call last): File "/opt/mycroft/mycroft/audio/speech.py", line 129, in mute_and_speak tts.execute(utterance, ident, listen) File "/opt/mycroft/mycroft/tts/tts.py", line 338, in execute self._execute(sentence, ident, listen) File "/opt/mycroft/mycroft/tts/tts.py", line 385, in _execute viseme = self.viseme(phonemes) if phonemes else None File "/opt/mycroft/mycroft/tts/mimic2_tts.py", line 208, in viseme vis_dur = float(pair[1]) IndexError: string index out of range ```

I don't know when this behavior began, exactly, but I first wondered if Mycroft had failed to reply last night, and I first definitively noticed about half an hour ago.

Maybe this belongs at Mimic, idk, but I've never noticed this on Linux.

[forslund]

I think this should be fixed through https://github.com/MycroftAI/mycroft-core/pull/2865/files, but there is a related issue for mimic1 See PR https://github.com/MycroftAI/mycroft-core/pull/2871

[krisgesling]

@chrisveilleux this is definitely fixed and deployed right?

I can't reproduce it currently.