ERP5Workflow: testDms: filter event with None action in getWorkflowEventInfoList

it was a coincidence that the first event was set by edit_workflow during
initialization: it was due to workflow list not sorted in chains_by_type

product/ERP5OOo/tests/testDms.py

@@ -2499,7 +2499,11 @@ return 1
     document.reject()
     document.share()
     logged_in_user = self.portal.portal_membership.getAuthenticatedMember().getId()
-    event_list = document.Base_getWorkflowEventInfoList()
+    # on the new document, during initialization, some workflow set the event's
+    # action to None, but they are not interesting in this test, just filter
+    # them
+    event_list = [event for event in document.Base_getWorkflowEventInfoList()
+                  if event.action is not None]
     event_list.reverse()
     # all actions by logged in user
     for event in event_list: