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/StackedSeriesLookup.java
throw new IllegalArgumentException( MessageFormat.format( Messages.getResourceBundle( 
									rtc.getULocale( ) )
									.getString( "exception.runtime.dataset.count.mismatch" ), 
									new Object[]{
											new Integer( ssl.iCachedUnitCount ),
											new Integer( iDataSetCount )
									} )
							);
						}
						if ( se.canBeStacked( ) )
						{
							if ( se.canShareAxisUnit( ) )
							{
								if ( se.isStacked( ) )
								{
									if ( sgSingle == null )
									{
										sgSingle = new StackGroup( iSharedUnitIndex++ );
										alSGCopies.add( sgSingle );
										iSharedUnitCount++;
									}
									ssl.htSeriesToStackGroup.put( se, sgSingle );
									sgSingle.addSeries( se ); 
									
									
								}
								else
								{
									sg = new StackGroup( iSharedUnitIndex++ );