issue #724 fixed

sails/src/api/controllers/StudentController.js

@@ -54,11 +54,12 @@ module.exports = {
         if (student) {
         if (student) {
           if (bcrypt.compareSync(req.body.password, student.password)) {
           if (bcrypt.compareSync(req.body.password, student.password)) {
             student.isStudent = true;
             student.isStudent = true;
-            student.license = student.license[0];
-            if (!student.license || student.license.hasExpired()) {
+            if (!student.license || !student.license[0] || student.license[0].hasExpired()) {
               sails.log.error(`Tried to login with non valid license ${req.body.username}`);
               sails.log.error(`Tried to login with non valid license ${req.body.username}`);
               return res.badRequest("Student has an invalid license");
               return res.badRequest("Student has an invalid license");
             } else
             } else
+              student = student.toObject(); // to enable overwrite license field
+              student.license = student.license[0];
               return res.ok({
               return res.ok({
                 user: student,
                 user: student,
                 token: sailsTokenAuth.issueToken(student, sails.config.jwt.expiresInMinutes),
                 token: sailsTokenAuth.issueToken(student, sails.config.jwt.expiresInMinutes),