TII-142 imporve error logging

git-svn-id: https://source.sakaiproject.org/contrib/turnitin/branches/TII-142@84356 fdecad78-55fc-0310-b1b2-d7d25cf747c9
TII-142 check content id is suplied at queue time

git-svn-id: https://source.sakaiproject.org/contrib/turnitin/branches/TII-142@84357 fdecad78-55fc-0310-b1b2-d7d25cf747c9