fix: fix quality issue

Author: UsamaSadiq

submissions/tests/test_viewsets.py

@@ -459,7 +459,7 @@ def test_get_submission_value_error(self, mock_get_files):
         """Test get_submission when processing raises ValueError."""
         queue_name = 'test_queue'
         self.client.login(username='testuser', password='testpass')
-        
+
         # Use the existing external grader from setUp and update its queue_name and status
         self.external_grader.queue_name = queue_name
         self.external_grader.status = 'pending'
@@ -469,7 +469,7 @@ def test_get_submission_value_error(self, mock_get_files):
         mock_get_files.side_effect = ValueError("File processing error")
 
         response = self.client.get(self.get_submission_url, {'queue_name': queue_name})
-        
+
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.assertEqual(response.data['return_code'], 1)
         self.assertIn("Error processing submission", response.data['content'])