propagate error with OpenAISpec

[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 #141

• Add 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.

Did you have fun?

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[codecov]

Codecov Report

Attention: Patch coverage is 82.60870% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80%. Comparing base (5995b0a) to head (743c519).

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #143   +/-   ##
===================================
+ Coverage    80%    80%   +1%     
===================================
  Files        13     13           
  Lines       880    890   +10     
===================================
+ Hits        700    715   +15     
+ Misses      180    175    -5     

[lantiga]

Looks good, nice catch