While running yum update for the first time on a vanilla RHEL5.1 install, the
following uncaught exception is thrown:

(58/96): rsh-0.17-38.el5. 100% |=========================|  44 kB    00:01     
(59/96): openldap-2.3.27- 100% |=========================| 295 kB    00:22     
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in ?
    yummain.main(sys.argv[1:])
  File "/usr/share/yum-cli/yummain.py", line 180, in main
    base.doTransaction()
  File "/usr/share/yum-cli/cli.py", line 395, in doTransaction
    problems = self.downloadPkgs(downloadpkgs) 
  File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 690, in downloadPkgs
    cache=po.repo.http_caching != 'none',
  File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 447, in getPackage
    cache=cache
  File "/usr/lib/yum-plugins/rhnplugin.py", line 209, in _getFile
    start, end, copy_local, checkfunc, text, reget, cache)
  File "/usr/lib/yum-plugins/rhnplugin.py", line 298, in _noExceptionWrappingGet
    return result
UnboundLocalError: local variable 'result' referenced before assignment