Kickstart using VNC fails inconsistently

Issue

• When attempting to kickstart a system with custom repositories while using VNC the install fails on an inconsistent basis with the following python backtrace.

11:53:12,401 DEBUG anaconda: is_valid_stage2_device(sda1) returning True
11:53:12,421 INFO anaconda: Thread Done: AnaCheckStorageThread (140411986822912)
11:53:12,685 INFO anaconda: spoke is ready: <pyanaconda.ui.gui.spokes.source.SourceSpoke object at 0x7fb4377914d0>
11:53:12,702 INFO anaconda: spoke is ready: <pyanaconda.ui.gui.spokes.software.SoftwareSelectionSpoke object at 0x7fb437789cd0>
11:53:12,709 DEBUG anaconda: running handleException
11:53:12,710 CRIT anaconda: Traceback (most recent call last):

  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 227, in run
    threading.Thread.run(self, *args, **kwargs)

  File "/usr/lib64/python2.7/threading.py", line 764, in run
    self.__target(*self.__args, **self.__kwargs)

  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/source.py", line 725, in _initialize
    self._reset_repoStore()

  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/source.py", line 1174, in _reset_repoStore
    ks_repo = self.data.RepoData(name=repo.name,

AttributeError: 'NoneType' object has no attribute 'name'