[tune] Fix best_trial_str for nested custom parameter columns #21078
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Why are these changes needed?
Currently, custom nested
parameter_columnsare not printed correctly in the best trial string. This PR fixes the printing error and adds a unit test.Related issue number
https://discuss.ray.io/t/best-trail-printing-none-when-input-a-nested-config/4427/3
Checks
scripts/format.shto lint the changes in this PR.