TII-162 Ignore instructors with no first or last name (merge c78024 from trunk)

git-svn-id: https://source.sakaiproject.org/contrib/turnitin/branches/sakai-10.x@87025 fdecad78-55fc-0310-b1b2-d7d25cf747c9
TII-163 Handle deleted sites more gracefully (merge r87026 from trunk)

git-svn-id: https://source.sakaiproject.org/contrib/turnitin/branches/sakai-10.x@87027 fdecad78-55fc-0310-b1b2-d7d25cf747c9