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
/**
	 * Renders the Chart Title Block
	 * 
	 * @param ipr
	 *            The Primitive Renderer of a Device Renderer
	 * @param b
	 *            The TitleBlock to render
	 * 
	 * @throws ChartException
	 */
	public void renderTitle( IPrimitiveRenderer ipr, TitleBlock b )
			throws ChartException
	{
		
		TextAlignment restoreValue = b.getLabel( )
				.getCaption( )
				.getFont( )
				.getAlignment( );
		b.getLabel( )
				.getCaption( )
				.getFont( )
				.setAlignment( switchTextAlignment( restoreValue ) );
		renderLabel( ipr, b, StructureSource.createTitle( b ) );
		
		b.getLabel( ).getCaption( ).getFont( ).setAlignment( restoreValue );
		if ( isInteractivityEnabled( ) )
		{
			Trigger tg;
			EList elTriggers = b.getTriggers( );
			Location[] loaHotspot = new Location[4];