fix: #3310 avoid empty chat tool outputs#3312

Aphroq wants to merge 1 commit intoopenai:mainopenai/openai-agents-python:mainfrom

Aphroq:fix/chatcmpl-nontext-tool-output-emptyAphroq/openai-agents-python:fix/chatcmpl-nontext-tool-output-emptyCopy head branch name to clipboard