Fix code style issues with Black

Author: lint-action

tests/commands/delete/test_delete_variants_cmd.py

@@ -46,6 +46,7 @@ def test_delete_variants_dry_run(mock_app, case_obj, user_obj):
     # And no variants should be deleted
     assert sum(1 for _ in store.variant_collection.find()) == n_initial_vars
 
+
 def test_delete_variants(mock_app, case_obj, user_obj):
     """Test deleting variants using the delete variants command line"""