Workflow.py: fix getPortalTypeListForWorkflow.

product/ERP5Workflow/Document/Workflow.py

@@ -345,11 +345,10 @@ class Workflow(IdAsReferenceMixin("", "prefix"), XMLObject):
         workflow_tool = portal.portal_workflow
         result = []
         append = result.append
-        document = info.object
-        if document  is not None:
-          if document.getTypeInfo() is not None:
-            for workflow_id in document.getTypeInfo().getTypeWorkflowList():
-                append(document.getPortalType())
+        for type_info in portal.portal_types.listTypeInfo():
+          portal_type = type_info.id
+          if workflow_id in type_info.getTypeWorkflowList():
+            append(portal_type)
         return result
 
     _getPortalTypeListForWorkflow = CachingMethod(getPortalTypeListForWorkflow,