Description of problem:
When installing in text mode, failed to install in anaconda

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

anaconda 14.14
F14-alpha-tc2

How reproducible:
100%

Steps to Reproduce:
1.Boot the installation passing the command line argument text

  
Actual results:

<report xmlns="http://www.redhat.com/gss/strata"><binding name="localhash">0768a7902f8fec5cd990f7cdc419d77b1b47f6238df3aeabb4288220f426c09c</binding><binding name="product" /><binding name="description">The following was filed automatically by anaconda:
anaconda 14.14 exception report
Traceback (most recent call first):
  File "/tmp/updates/pyanaconda/upgrade.py", line 86, in findRootParts
    oldInstalls += " on ".join(info)
  File "/tmp/updates/pyanaconda/dispatch.py", line 212, in moveStep
    rc = stepFunc(self.anaconda)
  File "/tmp/updates/pyanaconda/dispatch.py", line 131, in gotoNext
    self.moveStep()
  File "/tmp/updates/pyanaconda/text.py", line 510, in run
    anaconda.dispatch.gotoNext()
  File "/usr/bin/anaconda", line 887, in &lt;module&gt;
    anaconda.intf.run(anaconda)
TypeError: sequence item 0: expected string, NoneType found
</binding><binding fileName="/tmp/anaconda-tb-3d0kgf" name="pythonUnhandledException" type="text">anaconda 14.14 exception report
Traceback (most recent call first):
  File "/tmp/updates/pyanaconda/upgrade.py", line 86, in findRootParts
    oldInstalls += " on ".join(info)
  File "/tmp/updates/pyanaconda/dispatch.py", line 212, in moveStep
    rc = stepFunc(self.anaconda)
  File "/tmp/updates/pyanaconda/dispatch.py", line 131, in gotoNext
    self.moveStep()
  File "/tmp/updates/pyanaconda/text.py", line 510, in run
    anaconda.dispatch.gotoNext()
  File "/usr/bin/anaconda", line 887, in &lt;module&gt;
    anaconda.intf.run(anaconda)
TypeError: sequence item 0: expected string, NoneType found

Local variables in innermost frame:
info: (None, None, 'VolGroup-lv_root')
oldInstalls:
anaconda: &lt;pyanaconda.Anaconda object at 0xb71c556c&gt;
notUpgradable: [(None, None, 'VolGroup-lv_root')]


Expected results:
   1.  Anaconda uses text-mode for installation
   2. Anaconda completes successfully
   3. Reboot successfully into installed system 

Additional info: