Speech to text: Create en empty json file

[Rohan Juneja]

The command to download and preprocess the LibriSpeech dataset creates an empty json file.
brevitas_quartznet_preprocess --data_root=/path/to/validation/folder --data_set=DEV_OTHER

This causes the evaluation command to fail.

[Giuseppe Franco]

Thanks for pointing this out.
We will investigate the issue.

[Giuseppe Franco]

This should be fixed now. Thanks for opening the issue!