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
{
		final PluginSettings ps = PluginSettings.instance( );
		BaseRenderer[] brna = null;
		final boolean bPaletteByCategory = ( cm.getLegend( )
				.getItemType( )
				.getValue( ) == LegendItemType.CATEGORIES );
		if ( cm instanceof ChartWithAxes )
		{
			final ChartWithAxes cwa = (ChartWithAxes) cm;
			final Axis[] axa = cwa.getPrimaryBaseAxes( );
			Axis axPrimaryBase = axa[0];
			Series se;
			AxesRenderer ar = null;
			List al = new ArrayList( ), alRunTimeSeries;
			EList elBase, elOrthogonal;
			SeriesDefinition sd = null;
			int iSI = 0; 
			elBase = axPrimaryBase.getSeriesDefinitions( );
			if ( elBase.isEmpty( ) ) 
			{
				return createEmptyInstance( cm, rtc, oComputations );
			}
			else
			{
				
				
				
				final SeriesDefinition sdBase = (SeriesDefinition) elBase.get( 0 );
				alRunTimeSeries = sdBase.getRunTimeSeries( );
				if ( alRunTimeSeries.isEmpty( ) )