erp5_catalog: Add Folder class from ERP5Type core as an extra base class for CatalogTool.

product/ERP5Catalog/CatalogTool.py

@@ -42,6 +42,7 @@ from Acquisition import aq_base, aq_inner, aq_parent, ImplicitAcquisitionWrapper
 from Products.CMFActivity.ActiveObject import ActiveObject
 from Products.CMFActivity.ActivityTool import GroupedMessage
 from Products.ERP5Type.TransactionalVariable import getTransactionalVariable
+from Products.ERP5Type.Core.Folder import Folder
 
 from AccessControl.PermissionRole import rolesForPermissionOn
 
@@ -302,7 +303,7 @@ class RelatedBaseCategory(Method):
         'RELATED_QUERY_SEPARATOR': RELATED_QUERY_SEPARATOR,
       }
 
-class CatalogTool (UniqueObject, ZCatalog, CMFCoreCatalogTool, ActiveObject):
+class CatalogTool (UniqueObject, ZCatalog, CMFCoreCatalogTool, ActiveObject, Folder):
     """
     This is a ZSQLCatalog that filters catalog queries.
     It is based on ZSQLCatalog