Author: Jake Dallimore
MDL-35290 files: File manager reports files which can't be read
http://git.moodle.org/gw?p=moodle.git;a=commit;h=100a53119a719a1a5564fedc3e2db4eb70d19857
http://github.com/moodle/moodle/commit/100a53119a719a1a5564fedc3e2db4eb70d19857
+ 3.2 en [storedfilecannotreadfile,core_error]