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Bug: Environment variable ignored when config has falsy api_base
The check
"api_base" not in request_paramsprevents environment variables from being used whenconfig.completion_paramscontainsapi_basewith a falsy value like""orNone. This means if someone has an empty or nullapi_basein their config, the environment variablesEP_LLM_API_BASEorEP_LLM_BASE_URLwon't override it. The condition should checknot request_params.get("api_base")to allow environment variables to override falsy config values.