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Fixes error
Can't use an undefined value as an ARRAY reference at /nix/store/...-install-grub.pl line 642, <FILE> line 5.
with `/boot/grub/state` being:
```
grub
2.04
no
/dev/sda
/boot
```
I am not sure where the trailing empty line can come from; the script does not
seem to write it. In any case, now we handle that situation as well.
Further, ensure that `extraGrubInstallArgs` defaults to the empty array
if its key is not present in the `jsonState`.
|
||
|---|---|---|
| .. | ||
| generations-dir | ||
| generic-extlinux-compatible | ||
| grub | ||
| init-script | ||
| raspberrypi | ||
| systemd-boot | ||
| efi.nix | ||
| loader.nix | ||