Warn instead of raise when LLM generated class has *args and **kwargs.

[copybara-service[bot]]

Warn instead of raise when LLM generated class has *args and **kwargs.

This CL also removes a ineffective code block in eval/base.py.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.89%. Comparing base (dca88af) to head (29ae078).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #167 +/- ## ========================================== - Coverage 95.90% 95.89% -0.01% ========================================== Files 55 55 Lines 4489 4487 -2 Branches 973 786 -187 ========================================== - Hits 4305 4303 -2 Misses 92 92 Partials 92 92 ```

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