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
*/
	public void reLayout( )
	{
		getFigure( ).invalidateTree( );
		getFigure( ).getUpdateManager( ).addInvalidFigure( getFigure( ) );
	}
	protected void invalidParent( )
	{
		getFigure( ).getParent( ).revalidate( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.gef.editparts.AbstractEditPart#refreshChildren()
	 */
	protected void refreshChildren( )
	{
		super.refreshChildren( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.gef.EditPart#performRequest(org.eclipse.gef.Request)
	 */
	public void performRequest( Request request )
	{
		if ( RequestConstants.REQ_OPEN.equals( request.getType( ) ) )
		{
			Object obj = request.getExtendedData( )
					.get( DesignerConstants.TABLE_ROW_NUMBER );