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/CurveRenderer.java
private final double zeroLocation;
	private final Object oSource;
	private LineAttributes lia;
	private final Location loStart, loEnd;
	private final DeferredCache dc;
	private final ChartWithAxes cwa;
	private final boolean bShowAsTape;
	private final boolean bFillArea;
	private final boolean bUseLastState;
	private final boolean bKeepState;
	private final boolean bTranslucent;
	private final boolean bDeferred;
	private final boolean bConnectMissingValue;
	private final Location[] loa;
	private final Location3D[] loa3d;
	private final Location[] loPoints;
	private Location[] tempPoints;
	private final double dTapeWidth;
	private ColorDefinition fillColor, sideColor, tapeColor;
	private final BaseRenderer iRender;
	private final boolean bRendering3D;
	/**
	 * The constructor.
	 * 
	 * @param _render
	 * @param _lia
	 * @param _faX
	 * @param _faY
	 */
	public CurveRenderer( ChartWithAxes _cwa, BaseRenderer _render,