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
protected abstract int getImageType( );
	/**
	 * Updates the writer's parameters.
	 * 
	 * @param iwp
	 */
	protected void updateWriterParameters( ImageWriteParam iwp )
	{
		
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.device.IImageMapEmitter#getMimeType()
	 */
	public abstract String getMimeType( );
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.device.IImageMapEmitter#getImageMap()
	 */
	public String getImageMap( )
	{
		Map triggerMap = getTriggers( );
		if ( triggerMap == null || triggerMap.size( ) == 0 )
		{
			return null;
		}
		
		StringBuffer sb = new StringBuffer( );