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
{
					return createEmptyInstance( cm, rtc, oComputations );
				}
				
				
				
				se = (Series) alRunTimeSeries.get( 0 );
				ar = ( se.getClass( ) == SeriesImpl.class ) ? new EmptyWithAxes( )
						: (AxesRenderer) ps.getRenderer( se.getClass( ) );
				
				ar.set( cm, oComputations, se, axPrimaryBase, sdBase );
				ar.set( rtc );
				ar.iSeriesIndex = iSI++;
				al.add( ar );
				final Axis[] axaOrthogonal = cwa.getOrthogonalAxes( axPrimaryBase,
						true );
				for ( int i = 0; i < axaOrthogonal.length; i++ )
				{
					elOrthogonal = axaOrthogonal[i].getSeriesDefinitions( );
					for ( int j = 0; j < elOrthogonal.size( ); j++ )
					{
						sd = (SeriesDefinition) elOrthogonal.get( j );
						alRunTimeSeries = sd.getRunTimeSeries( );
						for ( int k = 0; k < alRunTimeSeries.size( ); k++ )
						{
							se = (Series) alRunTimeSeries.get( k );
							ar = ( se.getClass( ) == SeriesImpl.class ) ? new EmptyWithAxes( )
									: (AxesRenderer) ps.getRenderer( se.getClass( ) );
							
							ar.set( cm,