Description of problem:
I tried the latest rawhide compose xfce live 64 bit CD which had  anaconda-21.19-1.fc21.x86_64 version and it crashed with errors.

Version-Release number of selected component:
anaconda-core-21.19-1.fc21.x86_64

The following was filed automatically by anaconda:
anaconda 21.19-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/formats/fs.py", line 1387, in _getMinSize
    minSize = Size(spec="%d mb" % l.split(":")[1].strip())
  File "/usr/lib/python2.7/site-packages/blivet/formats/fs.py", line 222, in updateSizeInfo
    self._getMinSize(info=info)   # force calculation of minimum size
  File "/usr/lib/python2.7/site-packages/blivet/formats/fs.py", line 117, in __init__
    self.updateSizeInfo()
  File "/usr/lib/python2.7/site-packages/blivet/formats/__init__.py", line 82, in getFormat
    fmt = fmt_class(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1797, in handleUdevDeviceFormat
    device.format = formats.getFormat(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1154, in addUdevDevice
    self.handleUdevDeviceFormat(info, device)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2080, in _populate
    self.addUdevDevice(dev)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2021, in populate
    self._populate()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 426, in reset
    self.devicetree.populate(cleanupOnly=cleanupOnly)
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 145, in storageInitialize
    storage.reset()
  File "/usr/lib64/python2.7/threading.py", line 764, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 226, in run
    threading.Thread.run(self, *args, **kwargs)
TypeError: %d format: a number is required, not str

Additional info:
cmdline:        /usr/bin/python  /usr/sbin/anaconda
cmdline_file:   initrd=initrd0.img root=live:CDLABEL=Fedora-Live-Xfce-x86_64-rawhide- rootfstype=auto ro rd.live.image quiet  rhgb rd.luks=0 rd.md=0 rd.dm=0  BOOT_IMAGE=vmlinuz0 
executable:     /usr/sbin/anaconda
hashmarkername: anaconda
kernel:         3.14.0-0.rc0.git13.1.fc21.x86_64
other involved packages: python-libs-2.7.5-11.fc21.x86_64, python-blivet-0.39-1.fc21.noarch
product:        Fedora
release:        Fedora release 21 (Rawhide)
type:           anaconda
version:        rawhide