Config plugin: return EmptyModlist when no change is applied
When ipa config-mod is called with the option --enable-sid,
the code needs to trap EmptyModlist exception (it is expected
that no LDAP attribute is modified by this operation).
The code had a flaw and was checking:
'enable_sid' in options
instead of
options['enable_sid']
"'enable_sid' in options" always returns true as this option
is a Flag with a default value, hence always present even if
not specified on the command line.
Fixes: https://pagure.io/freeipa/issue/9063
Reviewed-By: Rob Crittenden <rcritten@redhat.com>