sepolicy: support non-MLS policy in gui

Several "sepolic gui" tabs raise exceptions when using a policy without
MLS because some dictionaries describing users and logins lack level and
range properties. Use conditions and get() where appropriate in order
to make "sepolicy gui" usable again with a non-MLS policy.

Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
2 files changed