Bug 148503 [regression]Data in list footer cannot be previewed in Web viewer
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/document/RowSaveUtil.java
int rowBytes = saveExprValue( valueMap );
			IOUtil.writeInt( this.rowLenDos, currentOffset );
			currentOffset += rowBytes;
			lastRowIndex = currIndex;
		}
		catch ( IOException e )
		{
			throw new DataException( ResourceConstants.RD_SAVE_ERROR,
					e,
					"Result Data" );
		}
	}
	
	/**
	 * @param currIndex
	 * @param exprID
	 * @param exprValue
	 * @throws DataException
	 */
	public int saveExprValue( Map valueMap ) throws DataException
	{
		initSave( false );
		ByteArrayOutputStream tempBaos = new ByteArrayOutputStream( );
		BufferedOutputStream tempBos = new BufferedOutputStream( tempBaos );
		DataOutputStream tempDos = new DataOutputStream( tempBos );
		try
		{
			IOUtil.writeInt( tempDos, valueMap.size( ) );
			Iterator it = valueMap.entrySet( ).iterator( );
			while ( it.hasNext( ) )