Bug 176582 "Show Lines as Curves" does not work correctly for Area Chart [0001]
Description: "Show Lines as Curves" does not work correctly for Area Chart. Build number: 2.2.0.v20070307-1128 Steps to reproduce: 1. New a Area Chart. 2. In "Format Chart" tab, select Series->Value (Y) Series, tick and untick "Show Lines as Curves" checkbox. Expected result: Null value point e is treated the same when tick and untick "Show Lines as Curves" checkbox. Actual result: Null value point e is treated differently (see the screenshot). Error log: N/A
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/BaseRenderer.java
lih.getWidth( ),
									Orientation.HORIZONTAL_LITERAL );
						}
					}
				}
			}
			else if ( d.getValue( ) == Direction.LEFT_RIGHT )
			{
				if ( lilh.getLegendItemHints( ) == null )
				{
					throw new ChartException( ChartEnginePlugin.ID,
							ChartException.RENDERING,
							"exception.null.legend.item.hints", 
							Messages.getResourceBundle( rtc.getULocale( ) ) );
				}
				LegendItemHints[] liha = lilh.getLegendItemHints( );
				LegendItemHints lih;
				int k = 0;
				Map columnCache = searchMaxColumnWidth( liha );
				for ( int j = 0; j < seda.length; j++ )
				{
					al = seda[j].getRunTimeSeries( );
					pa = seda[j].getSeriesPalette( );
					elPaletteEntries = pa.getEntries( );
					iPaletteCount = elPaletteEntries.size( );
					for ( int i = 0; i < al.size( ); i++ )
					{
						seBase = (Series) al.get( i );
						if ( !seBase.isVisible( ) )
						{