SAK-22282 - Finish patch of SAK-22436 to fix issues with SAK-22282

When the patch for SAK-22436 was applied, the _group_error velocity template
was missed along with a few additional message properties.

Upon testing, it appears that SAK-25316 does not occur.



git-svn-id: https://source.sakaiproject.org/svn/assignment/trunk@133241 66ffb92e-73f9-0310-93c1-f5514f145a0a