Git commits in Moodle 3.5.5 by sam marshall

commit cdfdef65b5afc4693ae091e2896eed297d077be4
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Wed, 27 Feb 2019 18:58:02 +0800
Tag:    v3.5.5

MDL-64961 REST web service: Fatal error in error handler