ERP5Catalog: Do not retrieve workflow catalog variables.

These are used nowhere in the code. In many workflows, these
"catalog-available" variables are only configured so they appear as fields on
worklist definitions. So it is understood as more of an informative setting
having a local effect than a normative one having an effect on how
indexation happens.
So shave off a bit of useless time spent in indexation.
Also, it should be mentionned that when profiling this code causes a big
red-herring: this code is the first place where workflow history gets
loaded (and presumably indexed document itself), which draws attention
away from potentially more interesting areas.

product/ERP5Catalog/CatalogTool.py

@@ -774,10 +774,6 @@ class CatalogTool (UniqueObject, ZCatalog, CMFCoreCatalogTool, ActiveObject):
         document_object = aq_inner(object)
         w = IndexableObjectWrapper(document_object)
 
-        wf = getToolByName(self, 'portal_workflow')
-        if wf is not None:
-          w.__dict__.update(wf.getCatalogVariablesFor(object))
-
         # Find the parent definition for security
         is_acquired = 0
         while getattr(document_object, 'isRADContent', 0):