[Bug]: lm_studio requires non-empty api_key even if there is no auth

[Lodimup]

What happened?

model =  "lm_studio/typhoon2-quen2.5-7b-instruct"
api_base =  "http://host.docker.internal:1234/v1"
...

    completion_kw = {
        "model": model,
        "messages": messages,
        "api_base": api_base,
        "max_tokens": max_tokens,
    }
    if api_base == "http://host.docker.internal:1234/v1":
        completion_kw["api_key"] = "lm_studio_needs_one"
    response = completion(**completion_kw)

works fine

    completion_kw = {
        "model": model,
        "messages": messages,
        "api_base": api_base,
        "max_tokens": max_tokens,
    }
    if api_base == "http://host.docker.internal:1234/v1":
        completion_kw["api_key"] = ""
    response = completion(**completion_kw)

fails

    completion_kw = {
        "model": model,
        "messages": messages,
        "api_base": api_base,
        "max_tokens": max_tokens,
    }
    response = completion(**completion_kw)

fails

Relevant log output

AuthenticationError: litellm.AuthenticationError: AuthenticationError: Lm_studioException - The api_key client option must be set either by passing api_key to the client or by setting the LM_STUDIO_API_KEY environment variable
  File "/tmp/windmill/wk-default-ba88b0a5a6db-rXH7K/01946fe6-19c2-4f33-a97c-2d076050b3fe/f/default/chat_completion.py", line 40, in main
    response = completion(**completion_kw)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/tmp/windmill/cache/python_311/litellm==1.58.2/litellm/utils.py", line 1030, in wrapper
    raise e

  File "/tmp/windmill/cache/python_311/litellm==1.58.2/litellm/utils.py", line 906, in wrapper
    result = original_function(*args, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/tmp/windmill/cache/python_311/litellm==1.58.2/litellm/main.py", line 2967, in completion
    raise exception_type(
          ^^^^^^^^^^^^^^^

  File "/tmp/windmill/cache/python_311/litellm==1.58.2/litellm/litellm_core_utils/exception_mapping_utils.py", line 2189, in exception_type
    raise e

  File "/tmp/windmill/cache/python_311/litellm==1.58.2/litellm/litellm_core_utils/exception_mapping_utils.py", line 355, in exception_type
    raise AuthenticationError(
{
    "body": null,
    "code": null,
    "type": null,
    "model": "typhoon2-quen2.5-7b-instruct",
    "param": null,
    "message": "litellm.AuthenticationError: AuthenticationError: Lm_studioException - The api_key client option must be set either by passing api_key to the client or by setting the LM_STUDIO_API_KEY environment variable",
    "request": "<Request('POST', 'https://api.openai.com/v1')>",
    "response": "<Response [500 Internal Server Error]>",
    "request_id": null,
    "max_retries": null,
    "num_retries": null,
    "status_code": 500,
    "llm_provider": "lm_studio",
    "litellm_debug_info": "\nModel: typhoon2-quen2.5-7b-instruct\nAPI Base: `http://host.docker.internal:1234/v1`\nMessages: `[{'content': 'สวัสดี', 'role': 'user'}]`",
    "litellm_response_headers": null
}

Are you a ML Ops Team?

No

What LiteLLM version are you on ?

1.58.2

Twitter / LinkedIn details

No response