ruff format and fix error

[rustybrooks-realitydefender]

diff is messy because I ran ruff format we should just make sure that our IDEs are set up to run that on save, and I guess at some point set it up in CI/CD

The actual fix is this

        self.base_url = config.get("base_url") or DEFAULT_API_ENDPOINT

The problem is that "base_url" DOES get set, but if no value is passed to RealityDefender() then that value is None, so .get() will return None

I also modified a test to check this

[mabeledo]

Good catch! I'm a bit surprised because I usually check the falsyness of a value in a dict using or, and here it seems I explicitly changed the code to use .get(key, [default]).