HORNETQ-1370 - Setting String property to null on a Message breaks XMLExporter tool
Merge pull request #1713 from jbertram/master-exportnullproperties

HORNETQ-1370 - Setting String property to null on a Message breaks XMLEx...
Merge pull request #1712 from jbertram/master

HORNETQ-1371 - Fix table formatting in new HA document
HORNETQ-1372 & BZ1113908 - TopicControl.listDurableSubscriptionsAsJSON does not work with heirarchical topics