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
{
				bos.close( );
				fis = new ByteArrayInputStream( baos.toByteArray( ) );
			}
			catch ( Exception ioex )
			{
				throw new ChartException( ChartReportItemPlugin.ID,
						ChartException.GENERATION,
						ioex );
			}
			if ( !"SVG".equals( sExtension ) && idr instanceof IImageMapEmitter ) 
			{
				imageMap = ( (IImageMapEmitter) idr ).getImageMap( );
			}
		}
		catch ( BirtException birtException )
		{
			Throwable ex = birtException;
			while ( ex.getCause( ) != null )
			{
				ex = ex.getCause( );
			}
			if ( ex instanceof ChartException
					&& ( (ChartException) ex ).getType( ) == ChartException.ZERO_DATASET )
			{
				
				
				return null;
			}
			if ( ex instanceof ChartException