Add a warning when ESP cannot be chainloaded
If in libvirt (Virt Manager - Boot options) the disk is not checked (even if its on the 2nd position after network) grub will not see the device. It's probably not marked as bootable. Anyway in XML terms it is this change: https://editor.mergely.com/aaWQldNq/
Let's add a warning because I've spent several hours troubleshooting this.