WorkflowTool.py: before processing DC workflow's worklist, check if the...

WorkflowTool.py: before processing DC workflow's worklist, check if the workflow has already been check by new workflow's worklist checker.

product/ERP5/Tool/WorkflowTool.py

@@ -748,6 +748,8 @@ class WorkflowTool(BaseTool, OriginalWorkflowTool):
             worklist_dict[wf_id] = a
 
     for wf_id in chain:
+      # check if the workflow has been checked.
+      if not did.has_key(wf_id):
         did[wf_id] = None
         wf = self.getWorkflowById(wf_id)
         if wf is not None: