Bug 180190 Some unnecessary error log is shown in charting
When a chart in a report has no data, or there is no SWT interactivity notifier hooked to the engine, an warning or error are logged. Those are normal conditions of execution and should only log with a INFO level.
chart/org.eclipse.birt.chart.reportitem/src/org/eclipse/birt/chart/reportitem/ChartReportItemPresentationImpl.java
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.extension.IReportItemPresentation#getOutputType()
	 */
	public int getOutputType( )
	{
		if ( "SVG".equals( sExtension ) ) 
		{
			return OUTPUT_AS_IMAGE;
		}
		else
		{
			return OUTPUT_AS_IMAGE_WITH_MAP;
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.extension.IReportItemPresentation#getImageMIMEType()
	 */
	public String getImageMIMEType( )
	{
		if ( idr instanceof IImageMapEmitter )
		{
			return ( (IImageMapEmitter) idr ).getMimeType( );
		}
		else if ( "SVG".equals( sExtension ) ) 
		{
			return "image/svg+xml";