Fixed bug in indexing objects with no keywords, which generated

spurious log entry about unindexing a non-existent object.

lib/python/SearchIndex/UnKeywordIndex.py

@@ -111,17 +111,13 @@ class UnKeywordIndex(UnIndex):
         # self.id is the name of the index, which is also the name of the
         # attribute we're interested in.  If the attribute is callable,
         # we'll do so.
-        newKeywords = getattr(obj, self.id, None)
+        newKeywords = getattr(obj, self.id, ())
         if callable(newKeywords):
             newKeywords = newKeywords()
 
         if type(newKeywords) is StringType:
             newKeywords = (newKeywords, )
 
-        if newKeywords is None:
-            self.unindex_object(documentId)
-            return 0
-
         # Now comes the fun part, we need to figure out what's changed
         # if anything from the previous record.
         oldKeywords = self._unindex.get(documentId, None)