auto_vot_decode.py crashes on voiced test dataset if min and max vot are not provided

[MichaelGoodale]

Currently if one runs auto_vot_decode.py --vot_tier vot --vot_mark vot config/voicedTestWavList.txt config/voicedTestTgList.txt models/VoicedModel.classifier the code runs for some time before crashing on one of the files with the following error:

16:37:07.944 [VotDecode] INFO: Decoding completed. Traceback (most recent call last): File "/home/michael/autovot/autovot/bin/auto_vot_decode.py", line 235, in <module> auto_vot_tier.append(Interval(textgrid.xmin(), xmin_preds[0], )) IndexError: list index out of range