Git commits in Moodle 3.5.4 by sam marshall

commit 02fab5539c1979b1fcf536abbf13323fd2f84cc7
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Fri, 04 Jan 2019 00:49:46 +0800
Tag:    v3.5.4

MDL-64497 GDPR: moodle_content_writer can cause endless loop