ensure to redirect to top when guest user is access to empty page

lib/routes/page.js

@@ -311,6 +311,12 @@ module.exports = function(crowi, app) {
             return ;
           }
 
+          // if guest user
+          if (!req.user) {
+            res.redirect('/');
+          }
+
+          // render editor
           debug('Catch pageShow', err);
           return renderPage(null, req, res);
         }