https://bugzilla.wikimedia.org/show_bug.cgi?id=71780

            Bug ID: 71780
           Summary: Error on video file pages
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: ImageMetrics
          Assignee: wikibugs-l@lists.wikimedia.org
          Reporter: gdu...@wikimedia.org
                CC: gdu...@wikimedia.org, gti...@wikimedia.org,
                    mtrac...@member.fsf.org
       Web browser: ---
   Mobile Platform: ---

TypeError: $file.attr(...) is undefined

data.fileType = $file.attr( 'alt' ).split( '.' ).pop();

The source of the issue is this line:

$file = $( '#file' ).find( 'img' );

Which assumes the presence of an image and passes the empty jQuery object
further along.

I think this might be a race condition to a degree, as the image might be part
of the DOM returned by the server, but TMH hijacks it as soon as it can.

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