Bug 191168 [Regression]Exception occurs when resize masterpage in library
Description: Exception occurs when resize masterpage in library. Build number:2.2.0.v20070606-0630 Regression bug:187443 Steps to reproduce: 1. New a library. 2. Go to Master Page, resize the master page using the ruler. Expected result: 1. Layout works correctly. 2. No exception is thrown out. Error log: An unexpected internal exception occurred.Please see log for detail. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Designer UI Plug-in ID:org.eclipse.birt.report.designer.ui Version:2.2.0.v20070606-0630 Error Code:Error.GUIException.invokedByUnexpectedException Error Message:org.eclipse.birt.report.designer.internal.lib.lalyout.LibraryReportDesignLayout
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
* request is silently ignored.
	 * 
	 * @param listener
	 *            the attribute listener to remove
	 * @return <code>true</code> if <code>listener</code> is successfully
	 *         removed. Otherwise <code>false</code>.
	 * 
	 */
	public boolean removeAttributeListener( IAttributeListener listener )
	{
		if ( attributeListeners == null )
			return false;
		return attributeListeners.remove( listener );
	}
	/**
	 * Broadcasts the file name event to the file name listeners.
	 * 
	 * @param event
	 *            the file name event
	 */
	public void broadcastFileNameEvent( AttributeEvent event )
	{
		if ( attributeListeners != null )
		{
			Iterator iter = attributeListeners.iterator( );
			while ( iter.hasNext( ) )
			{
				IAttributeListener listener = (IAttributeListener) iter.next( );
				listener.fileNameChanged( (ModuleHandle) getHandle( this ),
						event );