Cosmetic change so I can get my lost log message in. :-)

In the change just before this one, I
corrected the optimization of not applying unused indexes (although this
optimization does not seem right since index.id is not necessarily
equivalent to the key to look for in the request).  DateTime objects
don't have and don't need a __len__ attribute.

lib/python/Products/ZCatalog/Catalog.py

@@ -531,7 +531,7 @@ class Catalog(Persistent, Acquisition.Implicit, ExtensionClass.Base):
 
         rs   = None             # resultset
         data = self.data
-        
+
         if used is None: used={}
         for i in self.indexes.keys():
 
@@ -550,8 +550,6 @@ class Catalog(Persistent, Acquisition.Implicit, ExtensionClass.Base):
                     r, u = r
                     for name in u: used[name]=1
                     w, rs = weightedIntersection(rs, r)
-
-
                         
         #assert rs==None or hasattr(rs, 'values') or hasattr(rs, 'keys')
         if rs is None: