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
* 
	 * @param cm
	 * @param oComputations
	 * @return
	 */
	private static final BaseRenderer[] createEmptyInstance( Chart cm,
			RunTimeContext rtc, Object oComputations )
	{
		final BaseRenderer[] brna = new BaseRenderer[1];
		final AxesRenderer ar = new EmptyWithAxes( );
		ar.iSeriesIndex = 0;
		ar.set( cm, oComputations, null, null, null );
		ar.set( rtc );
		brna[0] = ar;
		return brna;
	}
	/**
	 * This method returns appropriate renders for the given chart model. It
	 * uses extension points to identify a renderer corresponding to a custom
	 * series.
	 * 
	 * @param cm
	 * @param rtc
	 * @param oComputations
	 * 
	 * @return
	 * @throws ChartException
	 */
	public static final BaseRenderer[] instances( Chart cm, RunTimeContext rtc,
			Object oComputations ) throws ChartException