CS bugfix

[bmwshop]

What does this PR do ?

Add a one line overview of what this PR aims to accomplish.
Fixes bug in processing multilingual / codeswitched tarred datasets

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

Changelog

• Add specific line by line info of high level changes in this PR
• isinstance(args[0], Iterable) replaced by List
• Because a string is an Iterable!

Usage

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• New Feature
• [ X] Bugfix
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Additional Information

• Related to # (issue)