Create RegistrationSingleton only after db exists

mayan/apps/registration/__init__.py

@@ -1,8 +1,10 @@
 from __future__ import absolute_import
 
-from django.db import transaction, DatabaseError
+from django.dispatch import receiver
 from django.utils.translation import ugettext_lazy as _
 
+from south.signals import post_migrate
+
 from common import about_view, license_view
 from navigation.api import register_links
 
@@ -18,8 +20,7 @@ form_view = {'text': _('Registration'), 'view': 'form_view', 'famfam': 'telephon
 register_links(['form_view'], [about_view, license_view], menu_name='secondary_menu')
 register_links(['form_view', 'about_view', 'license_view'], [form_view], menu_name='secondary_menu')
 
-try:
-    with transaction.atomic():
+
+@receiver(post_migrate, dispatch_uid='trigger_first_time', sender=RegistrationSingleton)
+def trigger_first_time(sender, **kwargs):
     RegistrationSingleton.objects.get_or_create()
-except DatabaseError:
-    pass