Fix value error in dataset module

[roytravel]

What does this PR do?

Fix value error when it do unpack. I referred here: https://github.com/sooftware/kospeech/issues/145

""" Traceback (most recent call last): File "./openspeech_cli/hydra_train.py", line 48, in hydra_main data_module.setup() File "/home/roytravel/github/openspeech/openspeech/datasets/ksponspeech/lit_data_module.py", line 171, in setup del_silence=self.configs.audio.del_silence if stage == 'train' else False, File "/home/roytravel/github/openspeech/openspeech/data/audio/dataset.py", line 142, in init self.audio_paths, self.transcripts, self.augments = zip(*tmp) ValueError: not enough values to unpack (expected 3, got 0) """

Before submitting

• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [ ] Was this discussed/approved via a Github issue? Please add a link to it if that's the case.
• [ ] Did you write any new necessary tests?

Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag

[upskyy]

@roytravel Thank you for your interest and PR. I will merge.