Only set buildMachinesFiles when nix.buildMachines is defined #432
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This should fix #430.
We should set
buildMachinesFiles
to[ "/etc/nix/machines" ]
only whennix.buildMachines
is set to a non-empty list because that causes that file to be generated.This should also be applied to <nixpkgs/nixos/modules/services/continuous-integration/hydra/default.nix>.