Workflow.py: change a condiction definition.

product/ERP5Workflow/Document/Workflow.py

@@ -1012,7 +1012,7 @@ class Workflow(IdAsReferenceMixin("", "prefix"), XMLObject):
     tdef_exprs = {}
     status = {}
     for id, vdef in self.getVariableValueList().items():
-      if not vdef.for_status:
+      if vdef.for_status == 0:
         continue
       expr = None
       if state_values.has_key(id):