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
if ( isActive( ) )
		{
			this.getViewer( ).setCursor( null );
		}
		super.eraseTargetFeedback( request );
	}
	protected void addChildVisual( EditPart part, int index )
	{
		
		
		this.getViewer( ).setCursor( null );
		super.addChildVisual( part, index );
	}
	/**
	 * The class use for select row in table.
	 *  
	 */
	public static class DummyColumnEditPart extends DummyEditpart
	{
		/**
		 * @param model
		 */
		public DummyColumnEditPart( Object model )
		{
			super( model );
			createEditPolicies( );
		}
		/*
		 * (non-Javadoc)
		 *