Produits Entr'ouvert » w.c.s.

Réproduit sur la dev Alfortville, workflow https://demarches-alfortville.dev.entrouvert.org/backoffice/workflows/22/ .
En cliquant par exemple sur le statut "Document transmis", ça crash avec la trace:

Exception:
  type = '<type 'exceptions.TypeError'>', value = 'is_available() got an unexpected keyword argument 'workflow''

Stack trace (most recent call first):
  File "/usr/lib/python2.7/dist-packages/wcs/admin/workflows.py", line 503, in is_item_available
   501 
   502     def is_item_available(self, item):
>  503         return item.is_available(workflow=self.workflow)
   504 
   505     def get_new_item_form(self):

  locals: 
     item = <class 'modules.payments.PaymentWorkflowStatusItem'>
     self = <wcs.admin.workflows.WorkflowStatusPage object at 0x7f0cf9ffd690>

  File "/usr/lib/python2.7/dist-packages/wcs/admin/workflows.py", line 507, in get_new_item_form
   505     def get_new_item_form(self):
   506         form = Form(enctype='multipart/form-data', action = 'newitem')
>  507         available_items = [x for x in item_classes if self.is_item_available(x)]
   508         def cmp_items(x, y):
   509             t = cmp(x.category and x.category[0], y.category and y.category[0])