Improper Handling of provider

[amanparmar17]

Improper handling of provider while creating llm object for TextGenerator.
Type in code line 32 in the file mentioned below

Code Link:
https://github.com/victordibia/llmx/blame/b0af8d1819488302019628b7c8d31bdb5051b366/llmx/generators/text/textgen.py#L34

def llm(provider: str = None, **kwargs):
    # load config. This will load the default config from
    # configs/config.default.yml if no path to a config file is specified. in
    # the environment variable LLMX_CONFIG_PATH
    config = load_config()
    if provider is None:
        # provider is not explicitly specified, use the default provider from the config file
        provider = config["model"]["provider"] if "provider" in config["model"] else None
        kwargs = config["model"]["parameters"] if "parameters" in config["model"] else {}
    if provider is None:
        logger.info("No provider specified. Defaulting to 'openai'.")
        provider = "openai"