Simplified code by eliminating an assignment.

source/java/com/whitemagicsoftware/rxm/ProxyParseTreeListener.java

		*/
		public void setListeners( List<ParseTreeListener> listeners ) {
		- if( listeners == null ) {
		- listeners = createParseTreeListenerList();
		- }
		-
		- this.listeners = listeners;
		+ this.listeners = listeners == null ?
		+ createParseTreeListenerList() : listeners;
		}

Delta	2 lines added, 5 lines removed, 3-line decrease