TII-162 Ignore instructors with no first or last name

git-svn-id: https://source.sakaiproject.org/contrib/turnitin/trunk@87024 fdecad78-55fc-0310-b1b2-d7d25cf747c9
TII-163 Handle deleted sites more gracefully

git-svn-id: https://source.sakaiproject.org/contrib/turnitin/trunk@87026 fdecad78-55fc-0310-b1b2-d7d25cf747c9