Session expire bug fix

Closes #93 (closed)

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

@@ -861,6 +861,7 @@ ServerConnector.login = function(login, password) {
   } else {
     params.login = "anonymous";
   }
+  self.getSessionData().setToken("");
   return self.sendPostRequest(self.loginUrl(), params).then(function() {
     self.getSessionData().setLogin(params.login);
     return Promise.resolve(self.getSessionData().getToken());