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
{
		brna = _brna;
	}
	/**
	 * Sets the runtime context object for current renderer.
	 */
	public final void set( RunTimeContext _rtc )
	{
		rtc = _rtc;
	}
	/**
	 * @return Returns the series rendering hints for current renderer.
	 */
	public final ISeriesRenderingHints getSeriesRenderingHints( )
	{
		return srh;
	}
	/**
	 * @return Returns the display server for current renderer.
	 */
	public final IDisplayServer getXServer( )
	{
		return xs;
	}
	/**
	 * @return Returns the scale of current device against standard 72dpi
	 *         (X/72).
	 */
	public final double getDeviceScale( )
	{