add blank TZ as UTC

apps/establishment/transfer_data.py

@@ -15,8 +15,6 @@ def transfer_establishment():
     # todo: filter(location__city__name__icontains='paris')
     old_establishments = Establishments.objects.exclude(
         id__in=list(Establishment.objects.all().values_list('old_id', flat=True))
-    ).exclude(
-        Q(location__timezone__isnull=True),
     ).prefetch_related(
         'establishmentinfos_set',
         'schedules_set',
@@ -46,7 +44,7 @@ def transfer_establishment():
         if item.location:
             data.update({
                 'location': item.location.id,
-                'tz': item.location.timezone,
+                'tz': item.location.timezone or 'UTC',
             })
 
         # Инфо