Make Sympa + payment support optional

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

participation/management/commands/fix_sympa_lists.py

@@ -1,6 +1,6 @@
 # Copyright (C) 2020 by Animath
 # SPDX-License-Identifier: GPL-3.0-or-later
-
+from django.conf import settings
 from django.core.management import BaseCommand
 from django.db.models import Q
 from participation.models import Team, Tournament
@@ -13,6 +13,9 @@ class Command(BaseCommand):
         """
         Create Sympa mailing lists and register teams.
         """
+        if not settings.ML_MANAGEMENT:
+            return
+
         sympa = get_sympa_client()
 
         sympa.create_list("equipes", "Equipes du TFJM2", "hotline",