Description of problem:
Reproduced twice.

1) Install over existing install.
2) Go to custom partitioning. 
3) Delete all existing file systems.
4) Switch from LVM to ext4 -> Update settings -> crash
The following was filed automatically by anaconda:
anaconda 19.23-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/devicefactory.py", line 97, in get_device_factory
    return factory_class(blivet, size, disks, **kwargs)
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 1875, in factoryDevice
    **kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 957, in _replace_device
    new_device = self.__storage.factoryDevice(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 1237, in _save_right_side
    selector=selector)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 2624, in on_apply_clicked
    self._save_right_side(self._current_selector)
TypeError: __init__() got an unexpected keyword argument 'container_raid_level'

Version-Release number of selected component:
anaconda-19.23-1

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda
cmdline_file:   initrd=initrd.img inst.stage2=hd:LABEL=Fedora\x2019-Beta-TC2\x20x86_64 quiet BOOT_IMAGE=vmlinuz 
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.9.0-0.rc8.git0.2.fc19.x86_64
product:        Fedora
release:        Cannot get release name.
type:           anaconda
version:        19-Beta-TC2

Truncated backtrace:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 2624, in on_apply_clicked
    self._save_right_side(self._current_selector)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 1237, in _save_right_side
    selector=selector)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 957, in _replace_device
    new_device = self.__storage.factoryDevice(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 1875, in factoryDevice
    **kwargs)
  File "/usr/lib/python2.7/site-packages/blivet/devicefactory.py", line 97, in get_device_factory
    return factory_class(blivet, size, disks, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'container_raid_level'