Description of problem:
I've merged changes with kdiff3, it crashed after saving the changes and closing kdiff3

Version-Release number of selected component:
rpmconf-1.0.12-1.fc23

Additional info:
reporter:       libreport-2.6.3
cmdline:        /usr/bin/python3 /usr/sbin/rpmconf -a -f kdiff3
executable:     /usr/sbin/rpmconf
kernel:         4.2.5-300.fc23.x86_64
runlevel:       N 5
type:           Python3
uid:            0

Truncated backtrace:
subprocess.py:620:check_output:subprocess.CalledProcessError: Command '['/usr/bin/ls', '-ltrd', '/etc/krb5.conf', '/etc/krb5.conf.rpmnew']' returned non-zero exit status 2

Traceback (most recent call last):
  File "/usr/sbin/rpmconf", line 63, in <module>
    main()
  File "/usr/sbin/rpmconf", line 60, in main
    rconf.run()
  File "/usr/lib/python3.4/site-packages/rpmconf/rpmconf.py", line 90, in run
    self._handle_package(pkg_hdr)
  File "/usr/lib/python3.4/site-packages/rpmconf/rpmconf.py", line 264, in _handle_package
    tmp.format(conf_file, "rpmnew"))
  File "/usr/lib/python3.4/site-packages/rpmconf/rpmconf.py", line 290, in _handle_rpmnew
    self._ls_conf_file(conf_file, other_file)
  File "/usr/lib/python3.4/site-packages/rpmconf/rpmconf.py", line 212, in _ls_conf_file
    universal_newlines=True))
  File "/usr/lib64/python3.4/subprocess.py", line 620, in check_output
    raise CalledProcessError(retcode, process.args, output=output)
subprocess.CalledProcessError: Command '['/usr/bin/ls', '-ltrd', '/etc/krb5.conf', '/etc/krb5.conf.rpmnew']' returned non-zero exit status 2

Local variables in innermost frame:
timeout: None
kwargs: {'universal_newlines': True}
popenargs: (['/usr/bin/ls', '-ltrd', '/etc/krb5.conf', '/etc/krb5.conf.rpmnew'],)
retcode: 2
process: <subprocess.Popen object at 0x7f81d81397f0>
inputdata: None
output: '-rw-r--r--. 1 root root 600  4.\xa0lis 13.08 /etc/krb5.conf\n'
unused_err: None