Description of problem:
happened after "dnf system-upgrade" without "download --releasever=23 --best"

Version-Release number of selected component:
dnf-1.1.3-1.fc22

Additional info:
reporter:       libreport-2.6.3
cmdline:        /usr/bin/python -OO /bin/dnf system-upgrade
dnf-makecache.log: -- No entries --
executable:     /bin/dnf
kernel:         4.2.5-201.fc22.x86_64
runlevel:       N 5
type:           Python
uid:            0

Truncated backtrace:
__init__.py:1020:_makeOutput:UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 40: ordinal not in range(128)

Traceback (most recent call last):
  File "/bin/dnf", line 36, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 198, in user_main
    errcode = main(args)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 84, in main
    return _main(base, args)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 117, in _main
    cli.configure(map(ucd, args))
  File "/usr/lib/python2.7/site-packages/dnf/cli/cli.py", line 1033, in configure
    self.command.configure(self.base.extcmds)
  File "/usr/lib/python2.7/site-packages/dnf-plugins/system_upgrade.py", line 414, in configure
    self.opts = self.parse_args(args)
  File "/usr/lib/python2.7/site-packages/dnf-plugins/system_upgrade.py", line 398, in parse_args
    dnf.cli.commands.err_mini_usage(self.cli, self.cli.base.basecmd)
  File "/usr/lib/python2.7/site-packages/dnf/cli/commands/__init__.py", line 52, in err_mini_usage
    txt = cli.cli_commands["help"]._makeOutput(cmd)
  File "/usr/lib/python2.7/site-packages/dnf/cli/commands/__init__.py", line 1020, in _makeOutput
    help_output += "\n\n%s" % summary
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 40: ordinal not in range(128)

Local variables in innermost frame:
help_output: u'system-upgrade [OPCIONES] [download --releasever=VERSION|reboot|clean|log]'
usage: u'[OPCIONES] [download --releasever=VERSION|reboot|clean|log]'
canonical_name: u'system-upgrade'
command: <class 'dnf.plugin.dynamic.system_upgrade.SystemUpgradeCommand'>
summary: 'Preparar el sistema para una nueva versi\xc3\xb3n'