bug#44872: Installer crash: 'uuid->string' is passed #f in lieu of a UUID

[Mathieu Othacehe]

Hey,

> I've installed Guix about 5 times after building an image from the
> latest changes, works perfectly for me both with encrypted and
> unencrypted root partitions.

Great, I improved the installation device detection again with:
e12be802e02b3345a753e7ec1287852a7337a0a5.

I think we can close that one.

Thanks,

Mathieu