added KWMultiMapping, another appendage from ZTables

lib/python/Products/ZCatalog/Catalog.py

@@ -91,6 +91,7 @@ from intSet import intSet
 from SearchIndex import UnIndex, UnTextIndex, UnKeywordIndex, Query
 from SearchIndex.Lexicon import Lexicon
 import regex, pdb
+from MultiMapping import MultiMapping
 from string import lower
 import Record
 from Missing import MV
@@ -104,6 +105,14 @@ class NoBrainer:
     """
     pass
 
+class KWMultiMapping(MultiMapping):
+    def has_key(self, name):
+        try:
+            r=self[name]
+            return 1
+        except KeyError:
+            return 0
+
 def orify(seq,
           query_map={
               type(regex.compile('')): Query.Regex,