Bug 153038 NPE when delete master page content in old report design.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/editparts/ListEditPart.java
{
	private static final String GUIDEHANDLE_TEXT = Messages
			.getString( "ListEditPart.GUIDEHANDLE_TEXT" ); 
	/**
	 * Constructor.
	 * 
	 * @param obj
	 */
	public ListEditPart( Object obj )
	{
		super( obj );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.internal.ui.editors.schematic.editparts.ReportElementEditPart#createGuideHandle()
	 */
	protected AbstractGuideHandle createGuideHandle( )
	{
		TableGuideHandle handle = new TableGuideHandle( this );
		handle.setIndicatorLabel( GUIDEHANDLE_TEXT );
		handle.setIndicatorIcon( ReportPlatformUIImages
				.getImage( IReportGraphicConstants.ICON_ELEMENT_LIST ) );
		return handle;
	}
	/*
	 * (non-Javadoc)
	 *