Bug 199714 NPE with invalid url[0002]
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
* @throws Exception
	 */
	protected void __initParameters( HttpServletRequest request )
			throws Exception
	{
		InputOptions options = new InputOptions( );
		options.setOption( InputOptions.OPT_REQUEST, request );
		options.setOption( InputOptions.OPT_LOCALE, locale );
		options.setOption( InputOptions.OPT_RTL, new Boolean( rtl ) );
		
		this.parameterDefList = getReportService( ).getParameterDefinitions(
				this.reportDesignHandle, options, false );
		
		if ( this.isDesigner
				&& !IBirtConstants.SERVLET_PATH_FRAMESET
						.equalsIgnoreCase( request.getServletPath( ) ) )
			parseConfigVars( request, parameterDefList );
		
		this.parametersAsString = getParsedParametersAsString(
				parameterDefList, request, options );
		
		if ( documentInUrl )
			this.missingParameter = false;
		else
			this.missingParameter = BirtUtility.validateParameters(
					parameterDefList, this.parametersAsString );
		
		this.isShowParameterPage = checkShowParameterPage( request );
		
		this.defaultValues = getDefaultValues( this.reportDesignHandle,