Git commits in Moodle 3.5.x by Jakob Ackermann

commit 4d5a33e424796c25f3941d66bfa792823402e56b
Author: Jakob Ackermann <jackermann@onlineschool.ca>
Date:   Thu, 12 Oct 2017 05:28:58 +0800
Tag:    v3.5.0-beta

MDL-60187 mod_lti: Do not create a grade item when grades are disabled.