Develop BUGFIX for StackOverflow Exception in org.openntf.arpa.NamePartsMap.getIDprefix()

Discovered a buck in org.openntf.arpa.NamePartsMap.getIDprefix() which was causing an infinite loop of Map.put() events, eventually causing a StackOverflow exception on the server.

Issue has been corrected.
spanky762:develop branch has been successfully locally merged with OpenNTF:Nathan branch and then pushed back to spanky762:develop.