Fix d'un warning

src/agenda_culturel/filters.py

@@ -294,7 +294,7 @@ class EventFilter(django_filters.FilterSet):
 
     def set_default_values(request):
         if request.user.is_authenticated:
-            if request.GET.get('status', None) == None:
+            if request.GET.get('status', None) is None:
                 tempdict = request.GET.copy()
                 tempdict['status'] = 'published'
                 request.GET = tempdict