prevent autoconnect admin services

periodic.py

@@ -101,6 +101,7 @@ def main():
         is_active=True,
         current_tariff=None
     ).exclude(last_connected_tariff=None).iterator():
+        try:
             tariff = ab.last_connected_tariff
             if tariff is None or tariff.is_admin:
                 continue
@@ -108,6 +109,8 @@ def main():
                 tariff, None,
                 "Автоматическое продление услуги '%s'" % tariff.title
             )
+        except LogicError as e:
+            print(e)
 
     # manage periodic pays
     ppays = PeriodicPayForId.objects.filter(next_pay__lt=now) \