nixos/tests: improve get_unit_info expressiveness on failure #73032
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Motivation for this change
The returning of None results in an unexpressive "'NoneType' object is not subscriptable" exception in wait_for_unit and require_unit_state when accessing the info dictionary.
Things done
Code conforms the Black coding style.
Changed the simple.nix test and ran it to provocate a failure and check if the Exception is thrown.
sandbox
innix.conf
on non-NixOS linux)nix-shell -p nix-review --run "nix-review wip"
./result/bin/
)nix path-info -S
before and after)Notify maintainers
cc @tfc @worldofpeace