Event listener that uses node type name filter gets NPE when root node is change

Create an event listener that filters by node type name, and then add (or change or remove) a property on the root node. In many cases, the result will be an NPE within JcrObservationManager (on or around line 814 and

Map<Name, Property> propMap = this.propertiesByLocation.get(parentLocation);
assert (propMap != null);

Here, when 'parentLocation' is the root, the 'propMap' result will be null.