fix(nix): no longer trying to access non existent attribute

[Libadoxon]

fixes the nix build. cfg-file doesn't exist if get-cfg is null, so checking if get-cfg is null instead of cfg-file

[Libadoxon]

Okay I just took a closer look at the nix code, with your permission I would rewrite the whole thing (mostly). Nothing against your nix skills but there a some serious anti patters and maintainability burdens that can be removed.

[grialion]

Okay I just took a closer look at the nix code, with your permission I would rewrite the whole thing (mostly). Nothing against your nix skills but there a some serious anti patters and maintainability burdens that can be removed.

It'd be really neat if you would do that!

[Libadoxon]

Superseded by #74