From c709583e06871838fb95c082d6b0604139879a8f Mon Sep 17 00:00:00 2001
From: Qwann <narmanli@clipper.ens.fr>
Date: Tue, 25 Jul 2017 14:07:20 +0200
Subject: [PATCH] Activity parent nullable

---
 event/models.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/event/models.py b/event/models.py
index 66db679..957e13a 100644
--- a/event/models.py
+++ b/event/models.py
@@ -167,6 +167,7 @@ class Activity(AbstractActivityTemplate):
                     ActivityTemplate,
                     related_name="children",
                     blank=True,
+                    null=True,
                 )
     staff = models.ManyToManyField(
                     User,