Bug 193467 URL hyperlink can't work in chart viewer
chart/org.eclipse.birt.chart.reportitem/src/org/eclipse/birt/chart/reportitem/ChartReportItemPresentationImpl.java
else if ( "SVG".equals( sExtension ) ) 
		{
			return "image/svg+xml"; 
		}
		else
		{
			return "image"; 
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.extension.IReportItemPresentation#getOutputContent()
	 */
	public Object getOutputContent( )
	{
		return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.extension.IReportItemPresentation#onRowSets(org.eclipse.birt.report.engine.extension.IRowSet[])
	 */
	public Object onRowSets( IRowSet[] irsa ) throws BirtException
	{
		
		if ( irsa == null || irsa.length < 1 || irsa[0] == null || irsa[0].isEmpty( ) )
		{