Git commits in Moodle 3.5.5 by Claude Vervoort

commit be5dd33e4d19f7593f2df0501bdfd6fd5790b414
Author: Claude Vervoort <claude.vervoort@cengage.com>
Date:   Thu, 31 Jan 2019 05:13:03 +0800
Tag:    v3.5.5

MDL-64730 LTI Adv: do not ignore 0 score