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
{
		return ( action.getType( ) == ActionType.URL_REDIRECT_LITERAL
				|| action.getType( ) == ActionType.SHOW_TOOLTIP_LITERAL || action.getType( ) == ActionType.INVOKE_SCRIPT_LITERAL );
	}
	/**
	 * Returns if the given format type or MIME type is supported by the
	 * registered JavaxImageIO writers.
	 * 
	 * @return
	 */
	protected boolean isSupportedByJavaxImageIO( )
	{
		boolean supported = false;
		
		String s = getFormat( );
		if ( s != null )
		{
			Iterator it = ImageIO.getImageWritersByFormatName( s );
			if ( it.hasNext( ) )
			{
				supported = true;
			}
		}
		
		if ( !supported )
		{
			s = getMimeType( );
			if ( s != null )
			{
				Iterator it = ImageIO.getImageWritersByMIMEType( s );