Developer credits
Git commits in Moodle 3.6.6 by Ilya Tregubov
commit 40b81687d6570ab26d4a1ec827e323bfc98e3a00 Author: Ilya Tregubov <ilyatregubov@catalyst-au.net> Date: Mon, 17 Jun 2019 13:37:32 +0800 Tag: v3.6.6 MDL-65925 assign: Grade page broken if submission was deleted.