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
oComputations,
									se,
									axaOrthogonal[i],
									bPaletteByCategory ? sdBase : sd );
							ar.iSeriesIndex = iSI++;
							al.add( ar );
						}
					}
				}
				
				brna = new BaseRenderer[iSI];
				for ( int i = 0; i < iSI; i++ )
				{
					ar = (AxesRenderer) al.get( i );
					ar.iSeriesCount = iSI;
					brna[i] = ar;
				}
			}
		}
		else if ( cm instanceof ChartWithoutAxes )
		{
			final ChartWithoutAxes cwoa = (ChartWithoutAxes) cm;
			EList elBase = cwoa.getSeriesDefinitions( );
			EList elOrthogonal;
			SeriesDefinition sd, sdBase;
			List alRuntimeSeries;
			final Series[] sea = cwoa.getRunTimeSeries( );
			Series se;
			final int iSeriesCount = sea.length;
			brna = new BaseRenderer[iSeriesCount];