Git commits in Moodle 3.7.3 by Matt Porritt

commit bf0a0ed1897e40cdfb208f5a8afce7e186c42408
Author: Matt Porritt <mattp@catalyst-net.au>
Date:   Tue, 30 Jul 2019 10:35:48 +0800
Tag:    v3.7.3

MDL-66225 Backup: fix irrecoverable state