zsqlcatalog method is expecting a dict, not None

product/ERP5Catalog/CatalogTool.py

@@ -683,6 +683,8 @@ class CatalogTool (UniqueObject, ZCatalog, CMFCoreCatalogTool, ActiveObject):
         predicate_property_dict = catalog.getPredicatePropertyDict(object)
         if predicate_property_dict is not None:
           w.predicate_property_dict = predicate_property_dict
+        else:
+          w.predicate_property_dict = dict()
         w.security_uid = security_uid
         (subject_set_uid, optimised_subject_list) = catalog.getSubjectSetUid(document_w)
         w.optimised_subject_list = optimised_subject_list