[k223kim]

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?

With google gemini models, if max_tokens is set too low, it may result in an empty response. To make it more reliable, this PR removes the default max_tokens value.

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?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84%. Comparing base (77c3566) to head (ec54cc7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@        Coverage Diff         @@
##           main   #59   +/-   ##
==================================
  Coverage    84%   84%           
==================================
  Files         8     8           
  Lines       431   431           
==================================
  Hits        364   364           
  Misses       67    67           

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