control USE_EXEMPTIONS_SHIFT_TEMPLATE before trying to read CagetteServices.get_exemptions_shift_id

members/admin.py

@@ -356,7 +356,10 @@ def manage_regular_shifts(request):
     template = loader.get_template('members/admin/manage_regular_shifts.html')
     committees_shift_id = CagetteServices.get_committees_shift_id()
     committees_shift_name = getattr(settings, 'COMMITTEES_SHIFT_NAME', "service des Comités")
+    if getattr(settings, 'USE_EXEMPTIONS_SHIFT_TEMPLATE', False) is True:
         exemptions_shift_id = CagetteServices.get_exemptions_shift_id()
+    else:
+        exemptions_shift_id = 0
     context = {
         'title': 'BDM - Créneaux',
         'module': 'Membres',