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fix(openapi): openapi chain will work without/empty description/summa… (#8351)

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Description: 

This PR will enable the Open API chain to work with valid Open API
specifications missing `description` and `summary` properties for path
and operation nodes in open api specs.

Since both `description` and `summary` property are declared optional we
cannot be sure they are defined. This PR resolves this problem by
providing an empty (`''`) description as fallback.

The previous behavior of the Open API chain was that the underlying LLM
(OpenAI) throw ed an exception since `None` is not of type string:

```
openai.error.InvalidRequestError: None is not of type 'string' - 'functions.0.description'
```

Using this PR the Open API chain will succeed also using Open API specs
lacking `description` and `summary` properties for path and operation
nodes.

Thanks for your amazing work !

Tag maintainer: @baskaryan

---------

Co-authored-by: Lars Gersmann <lars.gersmann@cm4all.com>
Co-authored-by: Bagatur <baskaryan@gmail.com>
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lars.gersmann 2023-07-28 02:58:43 +02:00 committed by GitHub
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commit e758e9e7f5
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2
libs/langchain/langchain/tools/openapi/utils/api_models.py
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@ -480,7 +480,7 @@ class APIOperation(BaseModel):
description = spec.paths[path].description or spec.paths[path].summary
return cls(
operation_id=operation_id,
description=description,
description=description or "",
base_url=spec.base_url,
path=path,
method=method,