Fix the null source strategy setting the page URL. The page URL is
expected to be nil when we can't determine the page containing the image URL.
Fixes the upload_media_assets.page_url field being filled for uploads
from unknown sites.
This directory contains library code used through Danbooru. This includes things like defining API clients, dealing with
sources, parsing tag searches, storing and resizing images, and so on.
Many of the files here use the Service Object pattern. Instead of putting complex code in models or controllers, it goes
here, in plain old Ruby objects (POROs). This keeps models and controllers simpler, and keeps domain logic isolated and
independent from the database and the HTTP request cycle.
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