Bug 188029 Top face is missing in Area chart of 2D+ with negative values
Top face is missing in Area chart of 2D+ with negative values. Please see attached screenshot.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/PlotWith2DAxes.java
{
				throw new IllegalArgumentException( MessageFormat.format( Messages.getResourceBundle( rtc.getULocale( ) )
						.getString( "exception.stacked.datetime.axis.series" ), 
						new Object[]{
							ax
						} ) );
			}
			Object oValue;
			int iSeriesPerGroup;
			double dGroupMin, dGroupMax, dValue, dAbsTotal, dPercentMax = 0, dPercentMin = 0;
			double dAxisMin = Double.MAX_VALUE, dAxisMax = -Double.MAX_VALUE;
			ArrayList alSeriesGroupsPerAxis = ssl.getStackGroups( ax );
			ArrayList alSeriesPerGroup;
			StackGroup sg;
			DataSetIterator[] dsi = new DataSetIterator[ssl.getSeriesCount( ax )];
			if ( alSeriesGroupsPerAxis == null )
			{
				throw new ChartException( ChartEnginePlugin.ID,
						ChartException.DATA_SET,
						"exception.internal.stack.series.setup", 
						new Object[]{
							ax
						},
						Messages.getResourceBundle( rtc.getULocale( ) ) );
			}
			logger.log( ILogger.INFORMATION,
					Messages.getString( "info.processing.stacked.info", 
							new Object[]{
								ax
							},