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
this( column, null );
	}
	/**
	 * Constructor
	 * 
	 * @param handle
	 */
	public ColumnHandleAdapter( ColumnHandle column, IModelAdapterHelper mark )
	{
		super( column, mark );
	}
	/**
	 * Gets the width
	 * 
	 * @return
	 */
	public int getWidth( )
	{
		DimensionHandle handle = getColumnHandle( ).getWidth( );
		if ( DesignChoiceConstants.UNITS_PERCENTAGE.equals( handle.getUnits( ) ) )
		{
			Object obj = getTableParent( );
			if ( obj instanceof GridHandle )
			{
				obj = HandleAdapterFactory.getInstance( )
						.getGridHandleAdapter( obj );
			}
			else
			{
				obj = HandleAdapterFactory.getInstance( )