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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:
```
{
"action":"some action",
"action_input":null
}
```
Issue:
None
Dependencies:
None