Developer credits
Git commits in Moodle 3.2.x by Danny Jung
commit 2dd87cb37a3448df877737eff0406e705145fcdc Author: Danny Jung <dannyjung90@gmail.com> Date: Sat, 27 May 2017 03:02:58 +0800 Tag: v3.2.4 MDL-59073 Workshop: Prevent submission without content or file