authselect: harden uninstallation of ipa client
When ipa client is uninstalled, the content of sysrestore.state
is read to restore the previous authselect profile and features.
The code should properly handle the case where sysrestore.state
contains the header for the authselect section, but the key=value
for profile and features are missing.
Fixes https://pagure.io/freeipa/issue/7657
Reviewed-By: Rob Crittenden <rcritten@redhat.com>