fix flake8

backend/metagenedb/apps/catalog/serializers/bulk_list.py

@@ -25,4 +25,4 @@ class BulkListSerializer(serializers.ListSerializer):
         return instances
 
     class Meta:
-        model = NotImplemented
\ No newline at end of file
+        model = NotImplemented

backend/metagenedb/apps/catalog/serializers/test_bulk_list.py

 from copy import deepcopy
 from unittest import TestCase
 from unittest.mock import Mock
-from rest_framework import serializers
 
 from metagenedb.apps.catalog.serializers.bulk_list import BulkListSerializer
 
@@ -24,7 +23,6 @@ class TestExtractManyToMany(TestCase):
         ]
         self.bulk_list_serializer = BulkListSerializerTestExtractManyToMany()
         self.info = Mock()
-        
 
     def test_extract_many_to_many(self):
         self.info.relations = {