Fix generator with dependencies without generator

[renesat]

When trying to generate a secret using a secret without generator, an error occurred. And not the assert that was removed. The code was falling on stringsWithDeps.textClosureMap and I could not understand what the problem was. If add any generator - all fine.

After figuring it out, I first thought I could re-mark the assert, but I thought I could filter out the dependencies. This should not break the order of password generation, because filtered secrets have no dependencies.

Reproduce

Config:

{config, ...}: {
  age.secrets.secret-1 = {
    rekeyFile = ./secret-1.age;
  };

  age.secrets.secret-2 = {
    rekeyFile = ./secret-2.age;
    generator = {
      dependencies = [
        config.age.secrets.secret-1
      ];
      script = {
        pkgs,
        lib,
        decrypt,
        deps,
        ...
      }: ''
        ${decrypt} ${(lib.elemAt deps 0).file} \
          | ${pkgs.apacheHttpd}/bin/htpasswd -niBC 10 "user"
      '';
    };
  };
}

Log

> agenix generate
Collecting information about hosts. This may take a while...
error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:34:12:
           33|
           34|   strict = derivationStrict drvAttrs;
             |            ^
           35|

       … while evaluating derivation 'agenix-generate'
         whose name attribute is located at /nix/store/v0g0bxsd5gw6k0jz2855f8h7l1218925-source/pkgs/stdenv/generic/make-derivation.nix:375:7

       … while evaluating attribute 'text' of derivation 'agenix-generate'
         at /nix/store/v0g0bxsd5gw6k0jz2855f8h7l1218925-source/pkgs/build-support/trivial-builders/default.nix:102:17:
          101|       ({
          102|         inherit text executable checkPhase allowSubstitutes preferLocalBuild;
             |                 ^
          103|         passAsFile = [ "text" ]

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: attribute '"./secret-1.age"' missing
       at /nix/store/v0g0bxsd5gw6k0jz2855f8h7l1218925-source/lib/strings-with-deps.nix:143:71:
          142|           else if done ? ${entry} then f done (tail todo)
          143|           else f (done // listToAttrs [{name = entry; value = 1;}]) ([predefined.${entry}] ++ tail todo);
             |                                                                       ^
          144|     in (f {} arg).result;

[oddlama]

Good catch, thank you for fixing this!