KNL-1063 fixing up the fields to 256 chars and adding TODOs about the null node = all nodes change

git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@307651 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-101 - Resource left open if the detector couldn't find a match


git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@307652 66ffb92e-73f9-0310-93c1-f5514f145a0a