Merge branch 'cherry-pick-d2c39b79' into 'release/1.4'

[Hotfix] [1.4] Comparing to False does not work on postgres

See merge request !397

website/mailinglists/views.py

@@ -41,7 +41,7 @@ def index(request):
     elif 'custom' in request.GET:
         if request.GET['custom'] == 'commissievoorzitters':
             memberships = (CommitteeMembership.active_memberships
-                           .filter(committee__board=False)
+                           .filter(committee__board=None)
                            .filter(chair=True)
                            .prefetch_related('member__user'))
             members = [x.member for x in memberships]