Author: Frederic Massart
MDL-36456 repository: S3 handles errors in a nicer way
http://git.moodle.org/gw?p=moodle.git;a=commit;h=50cff3c0cb37d6ad23476416ac4ccca4b28a3933
http://github.com/moodle/moodle/commit/50cff3c0cb37d6ad23476416ac4ccca4b28a3933
+ 2.3 en [errorwhilecommunicatingwith,core_repository]