Provide helper to select location title from get_data response

[kcloud]

Resolves #293. Modifies get_locations to include a helper providing the title field from ArchivesSpace API data.

[helrond]

@kcloud thanks, this looks good! I just did some linting and converted that first if statement to be a looser getattr check so if that setting isn't configured it will evaluate to False. I also added a default value of an empty list on the get inside each of those conditionals so we could get rid of the nested conditional check (if that makes sense, I feel like I am explaining it in a way that is more confusing than what I actually did).

For next time: you can run linting yourself by doing pre-commit run -a (you need to pip install pre-commit in your local virtual env first) or better yet, you can do pre-commit install in the root of the directory and then each time you commit those checks will run automatically.