Description of problem:
update-ks-profiles.py tracebacks when satellite has no kickstart

Version-Release number of selected component (if applicable):
sat540 + update from errata.stage
rhn-upgrade-5.4.0.24-1.el5sat

How reproducible:
deterministic

Steps to Reproduce:
# have a satellite with NO kickstart
# ./update-ks-profiles.py --list-invalid-profiles
Traceback (most recent call last):
  File "./update-ks-profiles.py", line 165, in ?
    main()
  File "./update-ks-profiles.py", line 151, in main
    list_invalid_profiles()
  File "./update-ks-profiles.py", line 53, in list_invalid_profiles
    for profile in profiles:
TypeError: iteration over non-sequence

# ./update-ks-profiles.py --update-ks-profiles         --verbose         --log /var/log/rhn/update-ks-profiles.log
Traceback (most recent call last):
  File "./update-ks-profiles.py", line 165, in ?
    main()
  File "./update-ks-profiles.py", line 161, in main
    update_ks_profiles(rc)
  File "./update-ks-profiles.py", line 82, in update_ks_profiles
    for profile in profiles:
TypeError: iteration over non-sequence

# pwd
/etc/sysconfig/rhn/satellite-upgrade

# rpm -qf update-ks-profiles.py
rhn-upgrade-5.4.0.24-1.el5sat

Actual results:
traceback

Expected results:
no traceback

Additional info:
if there is at least one ks then it works as expected