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.core/src/org/eclipse/birt/report/designer/core/model/schematic/ColumnHandleAdapter.java
* @return
	 */
	public int getColumnNumber( )
	{
		TableHandleAdapter adapter = HandleAdapterFactory.getInstance( )
				.getTableHandleAdapter( getTableParent( ) );
		return adapter.getColumns( ).indexOf( getColumnHandle( ) ) + 1;
	}
	private Object getTableParent( )
	{
		DesignElementHandle element = getColumnHandle( ).getContainer( );
		if ( element instanceof TableGroupHandle )
		{
			element = element.getContainer( );
		}
		return element;
	}
	private ColumnHandle getColumnHandle( )
	{
		return (ColumnHandle) getHandle( );
	}
	/**
	 * @param rowHeight
	 * @throws SemanticException
	 */
	public void setWidth( int columnWidth ) throws SemanticException
	{
		double value = MetricUtility.pixelToPixelInch( columnWidth );
		DimensionValue dimensionValue = new DimensionValue(
				value, DesignChoiceConstants.UNITS_IN );