Description of problem:
Booted into the liveusb, launched the installer and it simply crashed.

Version-Release number of selected component:
anaconda-core-21.48.6-1.fc21.x86_64

The following was filed automatically by anaconda:
anaconda 21.48.6-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 1148, in isNameValid
    if name.startswith("cciss/"):
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 244, in __init__
    if not self.isNameValid(name):
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 555, in __init__
    Device.__init__(self, name, parents=parents)
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 2270, in __init__
    super(ContainerDevice, self).__init__(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 3593, in __init__
    sysfsPath=sysfsPath)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1642, in handleUdevMDMemberFormat
    exists=True)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1889, in handleUdevDeviceFormat
    self.handleUdevMDMemberFormat(info, device)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1244, in addUdevDevice
    self.handleUdevDeviceFormat(info, device)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2170, in _populate
    self.addUdevDevice(dev)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2105, in populate
    self._populate()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 469, in reset
    self.devicetree.populate(cleanupOnly=cleanupOnly)
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 188, in storageInitialize
    storage.reset()
  File "/usr/lib64/python2.7/threading.py", line 766, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 227, in run
    threading.Thread.run(self, *args, **kwargs)
AttributeError: 'NoneType' object has no attribute 'startswith'

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-base
cmdline_file:   BOOT_IMAGE=/isolinux/vmlinuz0 root=live:LABEL=Fedora-Live-Workstation-x86_64-2 ro rd.live.image quiet rhgb rd.live.check
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.16.1-301.fc21.x86_64
other involved packages: python-blivet-0.62-1.fc21.noarch, python-libs-2.7.8-4.1.fc21.x86_64
product:        Fedora
release:        Fedora release 21 (Twenty One)
type:           anaconda
version:        21