Bug 179913 Meter Chart color by categories with null values does not work correctly [0001]
Description: Meter Chart color by categories with null values does not work correctly. Build number: 2.2.0.v20070329-1055 Steps to reproduce: 1. New a Meter Chart with values as follows: Moto, null; Nokia, 58; null, 66; Benq, null. 2. In "Format Chart" tab, select "Series" node, choose "Color by Categories". 3. Preview. Expected result: 1. The needle which shows the second value should take the second color. 2. There should be four in the legend area and the third name is null. Actual result: 1. The needle which shows the second value should take the first color. 2. There should be three in the legend area. Error log: N/A
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/LegendBuilder.java
final Legend lg = cm.getLegend( );
		LegendData legendData = new LegendData( );
		if ( !lg.isSetOrientation( ) )
		{
			throw new ChartException( ChartEnginePlugin.ID,
					ChartException.GENERATION,
					"exception.legend.orientation.horzvert", 
					Messages.getResourceBundle( xs.getULocale( ) ) );
		}
		if ( !lg.isSetDirection( ) )
		{
			throw new ChartException( ChartEnginePlugin.ID,
					ChartException.GENERATION,
					"exception.legend.direction.tblr", 
					Messages.getResourceBundle( xs.getULocale( ) ) );
		}
		
		final Orientation orientation = lg.getOrientation( );
		final Direction direction = lg.getDirection( );
		final Position lgPosition = lg.getPosition( );
		final boolean bPaletteByCategory = ( lg.getItemType( ).getValue( ) == LegendItemType.CATEGORIES );
		Label la = LabelImpl.create( );
		la.setCaption( TextImpl.copyInstance( lg.getText( ) ) );
		ClientArea ca = lg.getClientArea( );
		LineAttributes lia = ca.getOutline( );
		legendData.dSeparatorThickness = lia.getThickness( );
		la.getCaption( ).setValue( "X" ); 
		final ITextMetrics itm = xs.getTextMetrics( la );
		legendData.dItemHeight = itm.getFullHeight( );
		la.getCaption( ).setValue( ELLIPSIS_STRING );