clean code

lib/routes/login-passport.js

@@ -113,7 +113,7 @@ module.exports = function(crowi, app) {
       // find or register(create) user
       ExternalAccount.findOrRegister('ldap', ldapAccountId, usernameToBeRegistered)
         .catch((err) => {
-          if (err.name != null && err.name === 'DuplicatedUsernameException') {
+          if (err.name === 'DuplicatedUsernameException') {
             // get option
             const isSameUsernameTreatedAsIdenticalUser = Config.isSameUsernameTreatedAsIdenticalUser(config, 'ldap');
             if (isSameUsernameTreatedAsIdenticalUser) {
@@ -137,7 +137,7 @@ module.exports = function(crowi, app) {
           });
         })
         .catch((err) => {
-          if (err.name != null && err.name === 'DuplicatedUsernameException') {
+          if (err.name === 'DuplicatedUsernameException') {
             req.flash('isDuplicatedUsernameExceptionOccured', true);
             return next();
           }