Previously, unattached attachments would have unsightly `/?attachment_id=1` URLs. As we've moved away from attachments being specifically attached to posts, instead being Media items, this has made the unattached URLs a more common occurrence.
We can breath easy once more, knowing that the world is a little bit safer from the horror of unnecessarily ugly URLs.
Props SergeyBiryukov, wonderboymusic, pento.
Fixes#1914.
git-svn-id: https://develop.svn.wordpress.org/trunk@34690 602fd350-edb4-49c9-b593-d223f7449a82
ce14a63214