Added missing import to allow Finding objects using expressions.

lib/python/Products/ZCatalog/ZCatalog.py

@@ -95,6 +95,7 @@ import Products
 from Acquisition import Implicit
 from Persistence import Persistent
 from DocumentTemplate.DT_Util import InstanceDict, TemplateDict, cDocument
+from DocumentTemplate.DT_Util import Eval, expr_globals
 from AccessControl.Permission import name_trans
 from Catalog import Catalog, orify
 from SearchIndex import UnIndex, UnTextIndex