Description of problem:internal error reported 


Version-Release number of selected component (if applicable):


How reproducible:happens automatically


Steps to Reproduce:
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Actual results:Error Type: <type 'exceptions.TypeError'>
Error Value: 'NoneType' object is unsubscriptable
  File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 2316, in <module>
    main()
  File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 2313, in main
    backend.dispatcher(sys.argv[1:])
  File : /usr/lib/python2.5/site-packages/packagekit/backend.py, line 600, in dispatcher
    self.dispatch_command(args[0], args[1:])
  File : /usr/lib/python2.5/site-packages/packagekit/backend.py, line 504, in dispatch_command
    self.get_distro_upgrades()
  File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 1669, in get_distro_upgrades
    self._check_init()
  File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 1996, in _check_init
    self.yumbase.repos.doSetup()
  File : /usr/lib/python2.5/site-packages/yum/repos.py, line 71, in doSetup
    self.ayum.plugins.run('postreposetup')
  File : /usr/lib/python2.5/site-packages/yum/plugins.py, line 178, in run
    func(conduitcls(self, self.base, conf, **kwargs))
  File : /usr/lib/yum-plugins/rpm-warm-cache.py, line 32, in postreposetup_hook
    cmd = commands[0]



Expected results:


Additional info: