Fix check consistency script

management/commands/check_consistency.py

@@ -28,7 +28,7 @@ class Command(BaseCommand):
             else:
                 self.stdout.write(self.style.SUCCESS("La somme des notes vaut bien zéro."))
 
-        notes = None
+        notes = Note.objects.none()
         if options["check_all"]:
             notes = Note.objects.all()
         elif options["check"]: