Add additional new __repr_ function

app/models.py

@@ -438,7 +438,7 @@ class NotificationEmailData(db.Model):
         '''
         String representation of the NotificationEmailData. For human readability.
         '''
-        return '<NotificationData %r>' % self.id  # TODO: Why not .format()?
+        return '<NotificationData {id}>'.format(id=self.id)
 
     def to_dict(self):
         return {'id': self.id,