diff --git a/swh/web/ui/views/api.py b/swh/web/ui/views/api.py
--- a/swh/web/ui/views/api.py
+++ b/swh/web/ui/views/api.py
@@ -5,6 +5,7 @@
 
 from types import GeneratorType
 
+
 from flask import request, url_for, Response, redirect
 
 from swh.web.ui import service, utils