Howdy!

I found bug with minimal installation additional group selection.

Steps to reproduce.
1. Download netinstall iso (in my case
http://ftp.icm.edu.pl/pub/Linux/dist/scientific/7.4/x86_64/iso/SL-7.4-x86_64-netinst.iso)
2. During installation select minimal install with all additional groups
(compat-libraries, development, security-tools and smart-card).
3. There is bug presented in sl_bug_1.png
4. As you can see in sl_bug_2_here.png smart-card is not selected. There
is empty string ''.
5. After clicking yes on sl_bug_1.png groups smart-card group is
unselected (sl_bug_3.png), and group selecting is not working as
expected***.

*** After entering software selection once more and doing absolutely
nothing (just enter selection and click) done, the empty group ('')
information is once more present. Entering software selection one more
time leaves us with two groups only (devel and compat) and no error.

Bests,
Alex