Git commits in Moodle 3.7.3 by Peter

commit ce20bd7a7344d43ee8d2b0cd7474d4417d6a36eb
Author: Peter <peter@moodle.com>
Date:   Mon, 23 Sep 2019 11:21:10 +0800
Tag:    v3.7.3

MDL-65315 badges: Update the class and issuer OBv2.0 url

commit 341c68c7797a03e84145e036a8df866f9c4dc648
Author: Peter <peterrolanddias@gmail.com>
Date:   Mon, 29 Apr 2019 13:49:42 +0800
Tag:    v3.7.3

MDL-65429 mod_forum: Indicate subs fetch completion with no subs