Git commits in Moodle 3.6.7 by Trisha Milan

commit 90b9c2e2d346af842314d906a6a816c46f538e38
Author: Trisha Milan <trishamilan@catalyst-au.net>
Date:   Thu, 11 Apr 2019 14:46:07 +0800
Tag:    v3.6.7

MDL-65310 block_timeline: Hide activities without due date