LSNBLDR-49; improve XSS protection


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/branches/lessonbuilder-1.4.x@121076 66ffb92e-73f9-0310-93c1-f5514f145a0a
LSNBLDR-49; improve XSS protection


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/branches/lessonbuilder-1.4.x@121077 66ffb92e-73f9-0310-93c1-f5514f145a0a
LSNBLDR-206; missing null check


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/branches/lessonbuilder-1.4.x@121078 66ffb92e-73f9-0310-93c1-f5514f145a0a