promise simplified

frontend-js/src/main/js/ServerConnector.js

@@ -1048,10 +1048,8 @@ ServerConnector.isValidToken = function(token) {
 
 ServerConnector.logout = function() {
   var self = this;
-  return new Promise(function(resolve) {
-    self.getSessionData().setToken(undefined);
-    resolve();
-  });
+  self.getSessionData().setToken(undefined);
+  return Promise.resolve();
 };
 
 ServerConnector.getElementsByQuery = function(params) {