Description of problem:
- Boot into a Koji rawhide live CD image  from 30Jun2015 which was installed to a flash drive. The live CD boots up OK.
- click on the option to install to hard drive
- Anaconda promptly crashes. The popup error window says "An unknown error has occurred". The 'More info..." output seems to indicate a problem in a python script.

Version-Release number of selected component:
anaconda-core-23.12-1.fc23.x86_64

The following was filed automatically by anaconda:
anaconda 23.12-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python3.4/site-packages/blivet/tasks/fsminsize.py", line 57, in _getResizeInfo
    error_msg = "failed to gather info from resize program: %s" % e
  File "/usr/lib/python3.4/site-packages/blivet/tasks/fsminsize.py", line 168, in doTask
    resize_info = self._getResizeInfo()
  File "/usr/lib/python3.4/site-packages/blivet/formats/fs.py", line 288, in updateSizeInfo
    result = self._minsize.doTask()
  File "/usr/lib/python3.4/site-packages/blivet/formats/fs.py", line 134, in __init__
    self.updateSizeInfo()
  File "/usr/lib/python3.4/site-packages/blivet/formats/__init__.py", line 81, in getFormat
    fmt = fmt_class(*args, **kwargs)
  File "/usr/lib/python3.4/site-packages/blivet/populator.py", line 1427, in handleUdevDeviceFormat
    device.format = formats.getFormat(format_designator, **kwargs)
  File "/usr/lib/python3.4/site-packages/blivet/populator.py", line 757, in addUdevDevice
    self.handleUdevDeviceFormat(info, device)
  File "/usr/lib/python3.4/site-packages/blivet/populator.py", line 1656, in _populate
    self.addUdevDevice(dev)
  File "/usr/lib/python3.4/site-packages/blivet/populator.py", line 1593, in populate
    self._populate()
  File "/usr/lib/python3.4/site-packages/blivet/devicetree.py", line 551, in populate
    self._populator.populate(cleanupOnly=cleanupOnly)
  File "/usr/lib/python3.4/site-packages/blivet/blivet.py", line 279, in reset
    self.devicetree.populate(cleanupOnly=cleanupOnly)
  File "/usr/lib/python3.4/site-packages/blivet/osinstall.py", line 1119, in storageInitialize
    storage.reset()
  File "/usr/lib64/python3.4/threading.py", line 868, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/threads.py", line 244, in run
    threading.Thread.run(self, *args, **kwargs)
UnboundLocalError: local variable 'e' referenced before assignment

Additional info:
cmdline:        /usr/bin/python3  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-base
cmdline_file:   BOOT_IMAGE=/syslinux/vmlinuz0 root=live:LABEL=LIVE ro rd.live.image quiet rhgb
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         4.2.0-0.rc0.git2.1.fc23.x86_64
other involved packages: python3-blivet-1.7-1.fc23.noarch, python3-libs-3.4.3-5.fc23.x86_64
product:        Fedora
release:        Fedora release 23 (Rawhide)
type:           anaconda
version:        Rawhide