langchain: support the situation when action_input is null in json output_parser #29680
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Description:
This PR fixes handling of null action_input in [langchain.agents.output_parser]. Previously, passing null to action_input could cause OutputParserException with unclear error message which cause LLM don't know how to modify the action. The changes include:
Added null-check validation before processing action_input
Implemented proper fallback behavior with default values
Maintained backward compatibility with existing implementations
Error Examples:
Issue:
None
Dependencies:
None