SWF file upload returns Image requires a minimum width

[exalate-issue-sync[bot]]

Started happening randomly for some SWF files only. BlueImp server side handler checks for image width on non-image files, which is the root cause of the problem. Not sure why it has only just started to happen though.

[exalate-issue-sync[bot]]

Dan Garner commented: The supplied commit does for 1.8.13 - need to cherry pick to 2.0, 2.1 and 2.2