erp5_base: removes dangerous test condition in Delivery_init (fix for 56ef22ac)

bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/Delivery_init.py

@@ -5,5 +5,4 @@ elif kw.get('ledger', None) is not None:
 else:
   portal_type_id = context.getPortalType()
   portal_type = context.getPortalObject().portal_types.get(portal_type_id, None)
-  if portal_type:
-    context.setLedger(portal_type.getDefaultLedger(None))
+  context.setLedger(portal_type.getDefaultLedger(None))