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Description of problem:
I am using kickstart to install Severn on LVM logical volumes. The first
installation performs well. PV (hda2), VG (phnpcg208) and LVs (root, usr, var,
... ) are created and formated.

The second time, I try to reinstall over the same LVs and not format
/dev/phnpcg208/local.

Here are the kickstart files that I use 
Install
--------
clearpart --linux 
part /boot	--size 16 	--fstype ext2	--asprimary 
part pv.02			--size 1 --grow --noformat
volgroup phnpcg208 pv.02
logvol /                --vgname=phnpcg208  --size=300		--name=root	--fstype ext3
logvol swap		--vgname=phnpcg208  --size 128		--name=swap
logvol /usr             --vgname=phnpcg208  --size=2500		--name=usr	--fstype ext3
logvol /tmp             --vgname=phnpcg208  --size=300		--name=tmp	--fstype ext3
logvol /var             --vgname=phnpcg208  --size=300		--name=var	--fstype ext3
logvol /usr/local	--vgname=phnpcg208  --size=1 --grow	--name=local	--fstype ext3

Re-install
--------
part /boot	--onpart=hda1	--size 16 	--fstype ext2 
part pv.02	--onpart=hda2	--size 1 --grow --noformat
volgroup phnpcg208 pv.02
logvol /                --vgname=phnpcg208  --size=300		--name=root	--fstype ext3
logvol swap		--vgname=phnpcg208  --size 128		--name=swap
logvol /usr             --vgname=phnpcg208  --size=2500		--name=usr	--fstype ext3
logvol /tmp             --vgname=phnpcg208  --size=300		--name=tmp	--fstype ext3
logvol /var             --vgname=phnpcg208  --size=300		--name=var	--fstype ext3
logvol /usr/local	--vgname=phnpcg208  --size=1 --grow	--name=local	--fstype ext3
--noformat


Version-Release number of selected component (if applicable):
anaconda-9.0.93-1

How reproducible:
Always

Steps to Reproduce:
1. kickstart Severn on LVM logical volume with option clearpart
2. kickstart using the existing partions without clearpart
    

Actual Results:  Traceback (most recent call last):
  File "/usr/bin/anaconda", line 1025, in ?
    intf.run(id, dispatch, configFileData)
  File "/usr/lib/anaconda/gui.py", line 674, in run
    self.icw.run (self.runres, configFileData)
  File "/usr/lib/anaconda/gui.py", line 1415, in run
    self.setup_window(runres)
  File "/usr/lib/anaconda/gui.py", line 1387, in setup_window
    self.setScreen ()
  File "/usr/lib/anaconda/gui.py", line 1053, in setScreen
    (step, args) = self.dispatch.currentStep()
  File "/usr/lib/anaconda/dispatch.py", line 273, in currentStep
    self.gotoNext()
  File "/usr/lib/anaconda/dispatch.py", line 168, in gotoNext
    self.moveStep()
  File "/usr/lib/anaconda/dispatch.py", line 236, in moveStep
    rc = apply(func, self.bindArgs(args))
  File "/usr/lib/anaconda/partitioning.py", line 95, in partitioningComplete
    entry = request.toEntry(partitions)
  File "/usr/lib/anaconda/partRequests.py", line 166, in toEntry
    device = self.getDevice(partitions)
  File "/usr/lib/anaconda/partRequests.py", line 716, in getDevice
    pvs.append(partitions.getRequestByID(pv).getDevice(partitions))
AttributeError: 'NoneType' object has no attribute 'getDevice'

Expected Results:  formating /dev/phnpcg208/root, /dev/phnpcg208/usr,
/dev/phnpcg208/var, /dev/phnpcg208/var
presevering /dev/phnpcg208/local
installing

Additional info:

If kickstart contains the option upgrade instead of install then it does not crash

With a manual installation (without kickstart), I am able to select the pre
existing LV and perform the re-installation.

If I replace the directives : logvol by part (part / --onpart=phnpcg208/root
--fstype ext3, ...) then anaconda stops saying  that /dev/phnpcg208/root does
not exist. Even I add a %pre script :
vgscan
vgchange -ay