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[Frontend][Responses] Reject empty assistant message content with 400 instead of 500 - #64941
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An assistant message with an empty content list passed request validation (coerced to ResponseOutputMessage) but crashed the render path with IndexError in _construct_message_from_response_item (item.content[0]), producing a 500. Reject it at validation with a clear 400 instead, following the precedent of vllm-project#55974. Signed-off-by: shadowmodder <sudhir.vissa@sage7.ai>
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Fixes #64940.
An assistant message with an empty content list (
{"type": "message", "role": "assistant", "content": []}) passed request validation but crashed the render path withIndexErrorin_construct_message_from_response_item, returning a 500. This rejects it at validation with a clear 400, following the precedent of #55974.