DDS11 — (T#33) Clarification in use of set_listener operation

The description of the Entity method set_listener does not describe the result of this method if called with the value of the listener parameter set to NIL.
the value NIL is passed for the listener parameter. Chapter 2.1.2.1.1.3 (set_listener): Explicitly state that passing the value NIL for the listener is valid and clears the listener.
Resolution:
The description of this use-case shall be added to the description.
Revised Text:
Only one listener can be attached to each Entity. If a listener was already set, the operation set_listener will replace it with the new one. Consequently if the value 'nil' is passed for the listener parameter to this method any existing listener will be removed.

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