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Description of problem:
After cleaning the old partitions and manually creating a single PrepBoot partition the installer crashed.

Version-Release number of selected component:
anaconda-19.31.111-1

The following was filed automatically by anaconda:
anaconda 19.31.111-1 exception report
Traceback (most recent call first):
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 1169, in _do_refresh
    firstPage = self._accordion.allPages[0]
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 2368, in on_add_clicked
    self._do_refresh(mountpointToShow=mountpoint or fstype)
IndexError: list index out of range

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda
cmdline_file:   vnc
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.10.0-206.el7.ppc64
product:        Red Hat Enterprise Linux 7"
release:        Red Hat Enterprise Linux ComputeNode release 7.1 Beta (Maipo)
release_type:   pre-release
type:           anaconda
version:        Red Hat Enterprise Linux ComputeNode"

Created attachment 964242 [details]
File: anaconda-tb

Created attachment 964243 [details]
File: anaconda.log

Created attachment 964244 [details]
File: environ

Created attachment 964245 [details]
File: lsblk_output

Created attachment 964246 [details]
File: nmcli_dev_list

Created attachment 964247 [details]
File: os_info

Created attachment 964248 [details]
File: program.log

Created attachment 964249 [details]
File: storage.log

Created attachment 964250 [details]
File: syslog

Created attachment 964251 [details]
File: ifcfg.log

Created attachment 964252 [details]
File: packaging.log

I am not able to replicate the issue in RHEL 7.0, 7.1, or 7.2 nightly.

If this persists, please document in exact detail the steps taken to produce this error.