Fix/update audio to text dataset

[Jorjeous]

What does this PR do ?

Fix error when using transcribe speech parralel on webdataset

Collection: [Note which collection this PR will affect]
ASR

Changelog

• Add specific line by line info of high level changes in this PR.
• replacement of error to warning since there is no error

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# Add a code snippet demonstrating how to use this 

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[Jorjeous]

done

[github-actions]

[🤖]: Hi @Jorjeous 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g

[nithinraok]

Fix pylint warnings

[karpnv]

LGTM

[ko3n1g]

Please address these errors before: https://github.com/NVIDIA/NeMo/actions/runs/13215343601?pr=12045