api: Properly handle case when thumbnail can't be generated
For some images - gifs in particular - thumbnails can't be
generated by Fractal. In such cases m.extra_content
would
be None
. In attach_message()
, however, we unwrapped
extra_content
assuming it would never be None
. This
caused a crash when uploading gifs.
This commit makes sure that we handle the case of missing
extra_content
by making extra_content
in attach_file()
an Option<ExtraContent>
, then setting the thumbnail url
appropriately.
Incidentally, this commit also seems to fix an issue where images would show broken thumbnails after a user uploaded them.