Developer credits
Git commits in Moodle 3.7.0 by Dani Palou
commit 468ee73bba92669dfb95a99ec52ef429eef135c7 Author: Dani Palou <dani@moodle.com> Date: Mon, 04 Feb 2019 21:22:46 +0800 Tag: v3.7.0-beta MDL-64761 assign: Add tests for hidden grader in WS
commit 208e1376be51c542aea5bd3376b72026e3ddad2f Author: Dani Palou <dani@moodle.com> Date: Mon, 04 Feb 2019 19:28:34 +0800 Tag: v3.7.0-beta MDL-64761 assign: Return grader -1 when hidden in get_submission_status