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
legendData.sMinSliceLabel = IConstants.UNDEFINED_STRING;
			}
			else
			{
				legendData.sMinSliceLabel = rtc.externalizedMessage( legendData.sMinSliceLabel );
			}
		}
		
		if ( bMinSliceDefined
				&& bPaletteByCategory
				&& cm instanceof ChartWithoutAxes )
		{
			calculateExtraLegend( cm, rtc, legendData );
		}
		
		Label lgTitle = lg.getTitle( );
		Size titleSize = null;
		BoundingBox titleBounding = null;
		int iTitlePos = -1;
		if ( lgTitle != null && lgTitle.isSetVisible( ) && lgTitle.isVisible( ) )
		{
			lgTitle = LabelImpl.copyInstance( lgTitle );
			
			final String sPreviousValue = lgTitle.getCaption( ).getValue( );
			lgTitle.getCaption( )
					.setValue( rtc.externalizedMessage( sPreviousValue ) );
			try
			{
				titleBounding = Methods.computeBox( xs,
						IConstants.ABOVE,