Add additional handler to check existence

handlers/main.yml

@@ -23,5 +23,11 @@
     name: NetworkManager
     state: restarted
 
+- name: Check if grub.cfg exists
+  stat:
+    path: /boot/grub2/grub.cfg
+  register: grub_cfg
+  
 - name: Update GRUB
   command: /usr/sbin/grub2-mkconfig -o /boot/grub2/grub.cfg
+  when: grub_cfg.stat.exists