Bug 189586 [smoke]Fail to preview template item in xls format..[1203]
engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/ExcelEmitter.java
if ( out == null )
		{
			Object val = eservice.getOption( RenderOptionBase.OUTPUT_STREAM );
			if ( val != null && val instanceof OutputStream )
			{
				out = (OutputStream) val;
			}
		}
	}
	public void start( IReportContent report )
	{
		Report r = report.getDesign( );
		ReportItemWidthVisitor visitor = new ReportItemWidthVisitor( r );
		width = visitor.getColumnsWidth( );
		design2ExcelSpan = visitor.getDesign2ExcelSpan( );
		table2TableBinding = visitor.getTable2TableBinding( );
		try
		{
			int delta = 2;
			lb = new DeltaListBuffer( width.length, delta );
			engine = StyleEngine.createStyleEngine( lb );
		}
		catch ( Exception e )
		{
			logger.log( Level.WARNING, e.getMessage( ), e );
			throw new RuntimeException( "Error occur!" );
		}
	}
	public void startAutoText( IAutoTextContent autoText )
	{