Developer credits
Git commits in Moodle 2.8.10 by Jun Pataleta
commit 37ccc13b0f2ab6059ccc7f51519941f43ca95217 Author: Jun Pataleta <jun@moodle.com> Date: Tue, 20 Oct 2015 05:50:01 +0800 Tag: v2.8.10 MDL-51837 user: Check if user email is set on validation