Description of problem:
Listing the packages in a group

Version-Release number of selected component:
dnf-0.6.3-2.fc21

Additional info:
reporter:       libreport-2.3.0
cmdline:        /usr/bin/python -OO /usr/bin/dnf -v group info 'Sound and Video'
executable:     /usr/bin/dnf
kernel:         3.17.8-300.fc21.x86_64
runlevel:       N 5
type:           Python
uid:            1000

Truncated backtrace:
#1 _display_packages_verbose in /usr/lib/python2.7/site-packages/dnf/cli/output.py:683
#2 display_pkgs_in_groups in /usr/lib/python2.7/site-packages/dnf/cli/output.py:723
#3 _info in /usr/lib/python2.7/site-packages/dnf/cli/commands/group.py:197
#4 run in /usr/lib/python2.7/site-packages/dnf/cli/commands/group.py:442
#5 run in /usr/lib/python2.7/site-packages/dnf/cli/cli.py:1059
#6 _main in /usr/lib/python2.7/site-packages/dnf/cli/main.py:134
#7 main in /usr/lib/python2.7/site-packages/dnf/cli/main.py:84
#8 user_main in /usr/lib/python2.7/site-packages/dnf/cli/main.py:182
#9 <module> in /usr/bin/dnf:36