Remove defaults for required vars

roles/configuration/tasks/selinux.yml

@@ -3,7 +3,7 @@
   when: is_rhel | bool
   block:
     - name: Fix SELinux by pre-labeling the filesystem before first boot
-      when: os | lower in ['almalinux', 'rhel8', 'rhel9', 'rhel10', 'rocky'] and (selinux | bool)
+      when: os | lower in ['almalinux', 'rhel8', 'rhel9', 'rhel10', 'rocky'] and (selinux is not defined or selinux | bool)
       ansible.builtin.command: >
         arch-chroot /mnt /sbin/setfiles -v -F
         -e /dev -e /proc -e /sys -e /run
@@ -12,7 +12,7 @@
       changed_when: configuration_setfiles_result.rc == 0
 
     - name: Disable SELinux
-      when: os | lower == "fedora" or not (selinux | bool)
+      when: os | lower == "fedora" or (selinux is defined and not (selinux | bool))
       ansible.builtin.lineinfile:
         path: /mnt/etc/selinux/config
         regexp: ^SELINUX=