Make default image description blank
Currently the image description is set to the filename of the file being uploaded if it hasn't already been set.
The issue is that it doesn't really help to describe the image as the filename can be autogenerated or be simply set to "image.png", which doesn't really provide useful information. There's also been cases where it can leak which client the user posted with, which has lead to cases of harassment.
My proposed solution is that the description is set to be blank by default (like in Mastodon), and only be populated when someone explicitly sets a description.