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Description of problem:
Disk Druid fails when trying to reuse an existing volume group in 2
ways. Firstly after choosing Disk Druid, although the VG and all its
LVs are displayed in the tree widget, clicking on the LVM button gives
an error that at least 1 PV must be created first.

To circumvent this, I precreated an LV for my new root partition.
After choosing Disk Druid, I select my newly created LV in the tree
widget and click the edit button to assign it as the root partition.
Anaconda gives a stack trace and exits. (Will attach below)

I have tried the above using both LVM1 and LVM2 metadata with the same
results.

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


How reproducible:
Always

Steps to Reproduce:
1. Start installing RHEL4 Beta 1 on a machine with an existing volume
group.
2. Choose to partition using Disk Druid

A1: Click LVM

B1: Select an existing logical volume
B2: Click edit
    

Actual Results:
A: Warning is presented that a PV must be created first.
B: Anaconda fails with a stack trace.

Expected Results:
A: User is allowed to modify volume group.
B: User is allowed to edit properties of logical volume.

Additional info: