Bug 181704 Exception is thrown out when preview the attached design file as XLS PROTOTYPE [1203]
engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/ExcelEmitter.java
for ( int i = 0; i < row.length; i++ )
		{
			writer.writeTxtData( row[i] );
		}
		writer.endRow( );
	}
	private HyperlinkDef parseHyperLink( IContent content )
	{
		IHyperlinkAction linkaction = content.getHyperlinkAction( );
		if ( linkaction != null )
		{
			if ( linkaction.getType( ) == IHyperlinkAction.ACTION_BOOKMARK )
			{
				return new HyperlinkDef( linkaction.getBookmark( ).replaceAll(
						" ", "_" ), IHyperlinkAction.ACTION_BOOKMARK, null );
			}
			else if ( linkaction.getType( ) == IHyperlinkAction.ACTION_HYPERLINK )
			{
				return new HyperlinkDef( linkaction.getHyperlink( ),
						IHyperlinkAction.ACTION_HYPERLINK, null );
			}
			else if ( linkaction.getType( ) == IHyperlinkAction.ACTION_DRILLTHROUGH )
			{
				Action act = new Action( linkaction );
				IHTMLActionHandler actionHandler = null;
				Object ac = service.getOption( RenderOptionBase.ACTION_HANDLER );
				if ( ac != null && ac instanceof IHTMLActionHandler )
				{
					actionHandler = (IHTMLActionHandler) ac;
					actionHandler.getURL( act, null );