+* In the response to queries that use 'prop=imageinfo', entries for
+ non-existing files (indicated by the 'filemissing' field) now omit the
+ following fields, since they are meaningless in this context:
+ 'timestamp', 'userhidden', 'user', 'userid', 'anon', 'size', 'width',
+ 'height', 'pagecount', 'duration', 'commenthidden', 'parsedcomment',
+ 'comment', 'thumburl', 'thumbwidth', 'thumbheight', 'thumbmime',
+ 'thumberror', 'url', 'sha1', 'metadata', 'extmetadata', 'commonmetadata',
+ 'mime', 'mediadtype', 'bitdepth'.
+ Clients that process these fields should first check if 'filemissing' is
+ set. Fields that are supported even if the file is missing include:
+ 'canonicaltitle', ''archivename' (deleted files only), 'descriptionurl',
+ 'descriptionshorturl'.