Bug 75711 AstProvider should not create AST if requested by SelectionListenerWithASTManager
3.1 M2 If SelectionListenerWithASTManager waits for an AST and the editor closes we should not create an AST for that one but return null instead.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
* {@inheritDoc}
		 */
		public int getInt(String name) {
			int value= INT_DEFAULT_DEFAULT;
			String s= (String) fOptions.get(name);
			if (s != null) {
				try {
					value= new Integer(s).intValue();
				} catch (NumberFormatException e) {
				}
			}
			return value;
		}
		/**
		 * {@inheritDoc}
		 */
		public long getLong(String name) {
			long value= LONG_DEFAULT_DEFAULT;
			String s= (String) fOptions.get(name);
			if (s != null) {
				try {
					value= new Long(s).longValue();
				} catch (NumberFormatException e) {
				}
			}
			return value;
		}
		/**
		 * {@inheritDoc}
		 */