fix(bedrock): guard empty choices in mistral get_outputText

[dfedoryshchev]

AmazonMistralConfig.get_outputText guards choices by key presence only, so a present-but-empty choices ({"choices": []}, which a bedrock mistral/pixtral response can carry for a filtered or empty generation) reaches completion_response["choices"][0] and raises an uncaught IndexError that surfaces as a 500.

Added a length check so an empty choices falls through to the existing else and returns a clean BedrockError(status_code=400) instead. This mirrors the guard the sibling OpenAI-format handler already uses in invoke_handler.py ("choices" in completion_response and len(...) > 0).

Regression test feeds {"choices": []} through get_outputText and asserts BedrockError; it raised IndexError before this change.

[CLAassistant]

All committers have signed the CLA.

[greptile-apps]

Greptile Summary

This PR prevents empty Bedrock Mistral choices arrays from causing an indexing failure

• Requires choices to contain an item before parsing the OpenAI-compatible response shape
• Falls through to the existing BedrockError path for an empty response
• Adds a focused regression test for {"choices": []}

Confidence Score: 5/5

The PR appears safe to merge

The updated condition prevents indexing an empty choices array, preserves handling of nonempty choices and outputs responses, and the regression test directly exercises the corrected failure case

Important Files Changed

Filename	Overview
litellm/llms/bedrock/chat/invoke_transformations/amazon_mistral_transformation.py	Safely guards access to the first Mistral choice while preserving the existing outputs fallback and error behavior
tests/test_litellm/llms/bedrock/chat/test_mistral_config.py	Adds a focused regression test proving that an empty choices array raises the expected BedrockError

_{Reviews (1): Last reviewed commit: "fix(bedrock): guard empty choices in mis..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[codspeed-hq]

Merging this PR will not alter performance

✅ 31 untouched benchmarks

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_{Comparing dfedoryshchev:fix-bedrock-mistral-empty-choices (c586769) with litellm_internal_staging (b9b27c2)}

[Sanjays2402]

the outputs branch a few lines down indexes [0] the same way, so {"outputs": []} still raises IndexError instead of BedrockError. worth guarding both while you are here.