Bug 193467 URL hyperlink can't work in chart viewer
chart/org.eclipse.birt.chart.reportitem/src/org/eclipse/birt/chart/reportitem/ChartReportItemPresentationImpl.java
&& ( (ChartException) ex ).getType( ) == ChartException.ALL_NULL_DATASET )
			{
				
				
				return null;
			}
			if ( ( ex instanceof ChartException && ( (ChartException) ex ).getType( ) == ChartException.INVALID_IMAGE_SIZE ) )
			{
				
				
				logger.log( birtException );
				return null;
			}
			logger.log( ILogger.ERROR,
					Messages.getString( "ChartReportItemPresentationImpl.log.onRowSetsFailed" ) ); 
			logger.log( birtException );
			throw birtException;
		}
		catch ( RuntimeException ex )
		{
			logger.log( ILogger.ERROR,
					Messages.getString( "ChartReportItemPresentationImpl.log.onRowSetsFailed" ) ); 
			logger.log( ex );
			throw new ChartException( ChartReportItemPlugin.ID,
					ChartException.GENERATION,
					ex );
		}
		logger.log( ILogger.INFORMATION,
				Messages.getString( "ChartReportItemPresentationImpl.onRowSetsEnd" ) ); 
		if ( "SVG".equals( sExtension ) )