item: use brain attributes in Item_getTrackingList

no need to do catalog here

bt5/erp5_item/SkinTemplateItem/portal_skins/erp5_item/Item_getTrackingList.py

 from Products.ERP5Type.Document import newTempBase
 portal = context.getPortalObject()
-catalog = portal.portal_catalog.getResultValue
 if current:
   method = portal.portal_simulation.getCurrentTrackingList
 else:
   method = portal.portal_simulation.getTrackingList
 
-uid = context.getUid()
 
-history_list = []
 
-for res in method(aggregate_uid=uid, **kw):
+history_list = []
+for brain in method(aggregate_uid=context.getUid(), **kw):
   history = newTempBase(context, str(len(history_list)))
-  explanation = catalog(uid=res.delivery_uid)
-  node_value = catalog(uid=res.node_uid)
-  section_value = catalog(uid=res.section_uid)
-  resource_value = catalog(uid=res.resource_uid) 
+  explanation = brain.getExplanationValue()
+  date = brain.getDate()
   history.edit(
-      #uid = catalog(uid=res.uid).getTitle(),
-      date=res.getDate(),
-      node_title=node_value is not None and node_value.getTitle() or None,
+      date=date,
+      node_title=brain.node_title,
       source_title=explanation.getSourceTitle(),
-      section_title=section_value is not None and section_value.getTitle() or None,
-      resource_title=resource_value is not None and resource_value.getTitle() or None,
+      section_title=brain.section_title,
+      resource_title=brain.resource_title,
       explanation=explanation.getTitle(),
-      translated_portal_type = explanation.getTranslatedPortalType(),
-      quantity = explanation.getQuantity(),
+      translated_portal_type=explanation.getTranslatedPortalType(),
+      quantity=explanation.getQuantity(),
       url=explanation.absolute_url(),
-      item_quantity = context.getQuantity(at_date=res.getDate()), 
-      variation_category_item_list = [x[0] for x in explanation.getVariationCategoryItemList()],
+      item_quantity=context.getQuantity(at_date=date),
+      variation_category_item_list=[x[0] for x in explanation.getVariationCategoryItemList()],
       simulation_state=explanation.getTranslatedSimulationStateTitle(),
   )
- 
+
   history_list.append(history)
-  
+
 return history_list