create checkout dynamically

kfet/management/commands/loadkfetdevdata.py

@@ -81,13 +81,23 @@ class Command(MyBaseCommand):
         liq_account = Account.objects.get_or_create(cofprofile=liq_profile,
                                                     trigramme='LIQ')
 
+        # ---
+        # Caisse
+        # ---
+
+        checkout = Checkout.objects.get_or_create(
+            created_by=Account.objects.get(username='Moralelastix'),
+            name='Chaudron',
+            valid_from=timezone.now(),
+            valid_to=timezone.now() + timedelta(years=1)
+        )
+
         # ---
         # Opérations
         # ---
 
         articles = Article.objects.all()
         accounts = Account.objects.exclude(trigramme='LIQ')
-        checkout = Checkout.objects.all()[0]
 
         num_op = 100
         # Operations are put uniformly over the span of a week