yum 3.2.8 - checksum problem (it works fine on 3.0.5)

Hi,
I have a checksum problem after upgraded to yum 3.2.8 (from 3.0.5).

I have the following code  in the predownload hook.

- - - - -
def predownload_hook(conduit):
   pkglist = conduit.getDownloadPackages()
   for po in pkglist:
        for (csumtype, csum, csumid) in po.checksums:
             if csumid:
                   checksum = "%s:%s" % (csumtype, csum)
                   break	

   print "checksum: %s " % (checksum,)

=================
Note: that code is part of a bigger program. Just want to simplify the
problem

Every time I run yum (install), I got the following message:

UnboundLocalError: local variable 'checksum' referenced before assignment

==================
po.checksums is always empty. I tried it in several packages.

That code is working fine on yum 3.0.5 for the same set of packages (repos).
I always clean up the cache (yum clean all) before run the yum command.

Thx in advance for any pointer.

-Nicholas-
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