[FIX] purchase, purchase_requisition: make_po

When a product is set up to generate a purchase tender instead of a
purchase order, the associated procurement is set in exception.

This is because the result of `make_po` is returned by the method `_run`,
and the result of `_run` is used to determine if the procurement is
running or in exception. Since a purchase tender does not generate the PO,
the method `make_po` returns an empty list, and therefore the procurement
is considered as in exception.

The fix is to return the procurement_id instead if a purchase order or a
purchase tender has been created.

opw-672170

addons/purchase/purchase.py

@@ -904,7 +904,8 @@ class ProcurementOrder(models.Model):
                         po.write({'origin': po.origin})
                 else:
                     po.write({'origin': procurement.origin})
-            res += po.ids
+            if po:
+                res += [procurement.id]
 
             # Create Line
             po_line = False

addons/purchase_requisition/purchase_requisition.py

@@ -431,6 +431,7 @@ class procurement_order(osv.osv):
                 self.message_post(cr, uid, [procurement.id], body=_("Purchase Requisition created"), context=context)
                 procurement.write({'requisition_id': requisition_id})
                 req_ids += [procurement.id]
+                res += [procurement.id]
         set_others = set(ids) - set(req_ids)
         if set_others:
             res += super(procurement_order, self).make_po(cr, uid, list(set_others), context=context)