Update chain_filter_prompt template to handle ValueError response. #20979
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Fix for prompt_template where chain_filter_prompt can return a wordy response which produces multiple answers in model output, causing ValueError. In many cases you want model running chain_filter_prompt to be lightweight and this prompt injection helps accurately produce a more stable response.
THANK YOU LANGCHAIN TEAM!
--> Note to myself: If no one reviews your PR within a few days, please @-mention one of baskaryan, efriis, eyurtsev, hwchase17.