community: fix DallE hidden open_api_key

[bbaltagi-dtsl]

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• [ X]

  • Issue: issue DallEAPIWrapper is not working after upgrading to langchain-community==0.3.1 #26941

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[lury]

                "api_key": (
                    self.openai_api_key.get_secret_value() 
                    if self.openai_api_key 
                    else None
                ),

to pass ruff line length check -.-