Bug 154178 Support projectFolder in BIRT viewer
If the report supports projectFolder, the viewer also need to enhance for this feature.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
* Prepare the report parameters
	 */
	protected void __initParameters( HttpServletRequest request )
			throws Exception
	{
		this.reportDesignHandle = getDesignHandle( request );
		if ( this.reportDesignHandle == null )
			return;
		InputOptions options = new InputOptions( );
		options.setOption( InputOptions.OPT_REQUEST, request );
		options.setOption( InputOptions.OPT_LOCALE, locale );
		options.setOption( InputOptions.OPT_RTL, new Boolean( rtl ) );
		
		Collection parameterList = getParameterList( );
		
		if ( this.isDesigner
				&& !IBirtConstants.SERVLET_PATH_FRAMESET
						.equalsIgnoreCase( request.getServletPath( ) ) )
			parseConfigVars( request, parameterList );
		
		this.parametersAsString = getParsedParametersAsString( parameterList,
				request, options );
		
		this.parameterDefList = getReportService( ).getParameterDefinitions(
				this.reportDesignHandle, options, false );
		
		if ( documentInUrl )
			this.missingParameter = false;
		else
			this.missingParameter = validateParameters( parameterDefList,