Bug 118738 can't preview meter chart with grouping
Try to preview the following report with a meter chart group on the Y series, it fails. It used to work before, this is a regression. An exception is thrown org.eclipse.birt.chart.exception.ChartException: Can not plot meter series with null or non-numeric datapoint. at org.eclipse.birt.chart.render.DialRenderer.<init>(DialRenderer.java:132) at org.eclipse.birt.chart.render.Dial.compute(Dial.java:98) at org.eclipse.birt.chart.factory.Generator.build(Generator.java:759)
chart/org.eclipse.birt.chart.device.extension/src/org/eclipse/birt/chart/device/image/JavaxImageIOWriter.java
ResourceBundle.getBundle( Messages.DEVICE_EXTENSION,
								getLocale( ) ) );
			}
		}
		final ImageWriter iw = (ImageWriter) it.next( );
		logger.log( ILogger.INFORMATION,
				Messages.getString( "info.using.imagewriter", getLocale( ) ) 
						+ getFormat( ) + iw.getClass( ).getName( ) );
		
		final Object o = ( _oOutputIdentifier instanceof String ) ? new File( (String) _oOutputIdentifier )
				: _oOutputIdentifier;
		try
		{
			final ImageOutputStream ios = ImageIO.createImageOutputStream( o );
			updateWriterParameters( iw.getDefaultWriteParam( ) ); 
			
			
			
			
			
			iw.setOutput( ios );
			iw.write( (BufferedImage) _img );
			ios.close( );
		}
		catch ( Exception ex )
		{
			throw new ChartException( ChartDeviceExtensionPlugin.ID,
					ChartException.RENDERING,
					ex );
		}