bugfix: OpenAISpec populate missing zip

[aniketmaurya]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes a bug introduced when populate_context is available for a Spec in batched streaming loop.

• added test

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

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[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 79%. Comparing base (ec05a06) to head (ff248f7).

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #149   +/-   ##
===================================
- Coverage    80%    79%   -2%     
===================================
  Files        13     13           
  Lines       905    925   +20     
===================================
+ Hits        727    729    +2     
- Misses      178    196   +18     

[lantiga]

good catch, approved