Fails when used with %ai magic

[jhgoebbert]

When used with %ai magic as it fails with

ValidationError: 1 validation error for ChatBlabladorProvider
__root__
  Did not find openai_api_key, please add an environment variable `OPENAI_API_KEY` which contains it, or pass `openai_api_key` as a named parameter. (type=value_error)

This must be related to the following code

    auth_strategy =  EnvAuthStrategy(
        name="BLABLADOR_API_KEY", keyword_param="openai_api_key",
    )

in https://github.com/FZJ-JSC/jupyter-ai-blablador/blob/main/jupyter_ai_blablador/provider.py#L59

But even if I define OPENAI_API_KEY it claims this would be invalid even though the same key works fine in the chat-panel as you can see: