TCI11 — Add comments to QueryManager

It is unclear whether or not a null query is permissible.

Resolution / Discussion:
Explicitly state in the interface documentation that a null query should return all Entities in the QueryManager.

Revised Text:
Add sentence to 7.2.1.6 “In the case where a null query is passed to the QueryManager, the QueryManager is to return all Entities in the QueryManager.”