Git commits in Moodle 3.7.3 by Trisha Milan

commit 8faaa5da6591b152414e5ee76e96534b534880d3
Author: Trisha Milan <trishamilan@catalyst-au.net>
Date:   Thu, 11 Apr 2019 14:46:07 +0800
Tag:    v3.7.3

MDL-65310 block_timeline: Hide activities without due date