Users are able to upload 0-byte images

Excellent, thanks for adding the test.

This reminded me that I wanted to have a look at a weird upload error that D7 emits when the browser sends 0 bytes because e.g. something like AppArmor blocked it from reading the file locally - see: https://www.mcdruid.co.uk/article/stopping-apparmor-blocking-firefox-rea...

I don't think I got round to doing that (yet) though; it's probably more of an edge-case than this one, but relatively similar.

Automatically closed - issue fixed for 2 weeks with no activity.