Description of problem:
Python + unicode == lots of fun. Here's another backtrace in the middle of a transaction:

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/dnf/yum/rpmtrans.py", line 404, in callback
    self._scriptStop(bytes, total, h);
  File "/usr/lib/python2.7/site-packages/dnf/yum/rpmtrans.py", line 537, in _scriptStop
    self._scriptout()
  File "/usr/lib/python2.7/site-packages/dnf/yum/rpmtrans.py", line 201, in _scriptout
    self.display.scriptout(msgs)
  File "/usr/lib/python2.7/site-packages/dnf/cli/output.py", line 2429, in scriptout
    sys.stdout.write(unicode(msgs))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 6: ordinal not in range(128)
FATAL ERROR: python callback <bound method RPMTransaction.callback of <dnf.yum.rpmtrans.RPMTransaction object at 0x7fede05a8850>> failed, aborting!

Not sure which package it is; there's 1000+ in the list.

Version-Release number of selected component (if applicable):
dnf-0.5.1-1.fc21.noarch