notification email on student unlinking

sails/src/api/controllers/StudentController.js

@@ -475,6 +475,9 @@ module.exports = {
     })
     .spread((stuSup, student) => {
 
+      if (!student)
+        throw new Error("Student not found");
+
       //
       // Remove relationship
       //
@@ -486,19 +489,21 @@ module.exports = {
       //
       student = student.toJSON();
       if (student.license && student.license.number) {
+        var message = sails.__(
+          {
+            phrase: 'student_unlinked',
+            locale: supervisor.lang
+          },
+          {
+            name: student.name,
+            surname: student.surname,
+            license: student.license.number
+          });
+        console.log("-->" + message);
         mailService.mailer()
         .send({
           to: supervisor.email,
-          text: sails.__(
-            {
-              phrase: 'student_unlinked',
-              locale: supervisor.lang
-            },
-            {
-              name: student.name,
-              surname: student.surname,
-              license: student.license.number
-            })
+          text: message
         })
         .then(() => {})
         .catch((err) => {});