clean code

lib/routes/login-passport.js

@@ -177,7 +177,7 @@ module.exports = function(crowi, app) {
         if (!isValidLdapUserByGroupFilter(user)) {
           return res.json({
             status: 'warning',
-            message: 'An user is found, but the groups are empty.',
+            message: 'The user is found, but that has no groups.',
           });
         }
         return res.json({