Prevent Grub fix from failing on non-UEFI hosts

etc/kayobe/ansible/fix-grub-rl9.yml

@@ -3,13 +3,19 @@
   hosts: overcloud
   become: yes
   gather_facts: true
-
   tasks:
-    - name: Remove "--root-dev-only" from /boot/efi/EFI/rocky/grub.cfg
-      ansible.builtin.replace:
-        path: /boot/efi/EFI/rocky/grub.cfg
-        regexp: '--root-dev-only\s?'
-        replace: ''
+    - block:
+        - name: Check that /boot/efi/EFI/rocky/grub.cfg exists
+          ansible.builtin.stat:
+            path: /boot/efi/EFI/rocky/grub.cfg
+          register: stat_result
+
+        - name: Remove "--root-dev-only" from /boot/efi/EFI/rocky/grub.cfg
+          ansible.builtin.replace:
+            path: /boot/efi/EFI/rocky/grub.cfg
+            regexp: '--root-dev-only\s?'
+            replace: ''
+          when: stat_result.stat.exists
       when:
         - ansible_facts['distribution'] == 'Rocky'
         - ansible_facts['distribution_major_version'] == '9'