Linter changes done

Currently not able to run pylint for django, remaining pylint errors are irrellevant for django or is based on comments

backend/secfit/workouts/views.py

@@ -86,6 +86,7 @@ class RememberMe(
         # Validate signature
         if sign == self.sign_user(user):
             return user
+        return None
 
     def rememberme(self):
         creds = [self.request.user, self.sign_user(str(self.request.user))]