Description of problem:
Traceback happened with simple update

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

2.27.2

How reproducible:


Steps to Reproduce:
1. Just do a normal update
2.
3.
  
Actual results:

Traceback (most recent call last):
  File "/usr/share/PackageKit/helpers/yum/yumBackend.py", line 1830, in _runYumTransaction
    rpmDisplay=rpmDisplay)
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 3609, in processTransaction
    pkgs = self._downloadPackages(callback)
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 3633, in _downloadPackages
    probs = self.downloadPkgs(dlpkgs)
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 1313, in downloadPkgs
    self.plugins.run('predownload', pkglist=pkglist)
  File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 180, in run
    func(conduitcls(self, self.base, conf, **kwargs))
  File "/usr/lib/yum-plugins/presto.py", line 577, in predownload_hook
    (problems, more) = downloadPkgs(conduit, pinfo, download_pkgs)
  File "/usr/lib/yum-plugins/presto.py", line 419, in downloadPkgs
    cb.start(text="<delta rebuild>", size=rebuild_size)
  File "/usr/lib/python2.6/site-packages/urlgrabber/progress.py", line 129, in start
    self._do_start(now)
  File "/usr/share/PackageKit/helpers/yum/yumBackend.py", line 2551, in _do_start
    self.updateProgress(name, 0.0, "", "")
  File "/usr/share/PackageKit/helpers/yum/yumBackend.py", line 2593, in updateProgress
    pkg = self._getPackage(name)
  File "/usr/share/PackageKit/helpers/yum/yumBackend.py", line 2534, in _getPackage
    sections = name.rsplit('-', 2)
AttributeError: 'NoneType' object has no attribute 'rsplit'


Expected results:

PackageKit should update normally.

Additional info: