some workflow don't have history variable (like...

some workflow don't have history variable (like knowledge_pad_validation_workflow) and an error is raised.
This is not good : in some cases, we can want to not have history on some workflow. In this way, None is return and nothing raised in case of workflow without history


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26131 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Base.py

@@ -3158,7 +3158,10 @@ class Base( CopyContainer,
     wf_list = list(portal_workflow.getWorkflowsFor(self))
     if wf is not None: wf_list = [wf] + wf_list
     for wf in wf_list:
-      history = wf.getInfoFor(self, 'history', None)
+      try:
+        history = wf.getInfoFor(self, 'history', None)
+      except:
+        history = None
       if history is not None:
         if len(history):
           # Then get the first line of edit_workflow
@@ -3183,7 +3186,10 @@ class Base( CopyContainer,
       wf_list = [wf] + wf_list
     max_date = None
     for wf in wf_list:
-      history = wf.getInfoFor(self, 'history', None)
+      try:
+        history = wf.getInfoFor(self, 'history', None)
+      except:
+        history = None
       if history is not None and len(history):
         date = history[-1].get('time', None)
         # Then get the last line of edit_workflow