Bug 129886 Delect a column contain the marge row which contain some item, Error message pop up
Details: Delect a column contain the marge row which contain some item, Error message pop up Setp: 1.New a library and add a 3*3 grid 2.Insert a label in cell(1,1) 3.Marge the cell of (1,1) and (1,2) 4.Delete column 1. Actual result: An error message pop up
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/editparts/TableEditPart.java
* (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_TABLE ) );
		return handle;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.gef.EditPart#activate()
	 */
	public void activate( )
	{
		super.activate( );
		addListenerToChildren( );
	}
	/*
	 * s (non-Javadoc)
	 * 
	 * @see org.eclipse.gef.EditPart#deactivate()
	 */
	public void deactivate( )
	{
		super.deactivate( );
		removeRowListener( );