Attempting to build an npm package with no dependencies panics

[OmnipotentEntity]

The cause is a bare unwrap here.

https://github.com/NixOS/nixpkgs/blob/efdfa300eeb8b1bc21dad55a845a673821f903da/pkgs/build-support/node/fetch-npm-deps/src/main.rs#L53

Discovered in attempting to package ogatak, (lock)

[OmnipotentEntity]

Flake for reproduction:

# Inspired by pkgs/applications/editors/uivonim/default.nix
# and pkgs/by-name/in/indiepass-desktop/package.nix
{ lib, buildNpmPackage, fetchFromGitHub, electron }:

buildNpmPackage rec {
  pname = "ogatak";
  version = "2.0.7";

  src = fetchFromGitHub {
    owner = "rooklift";
    repo = "ogatak";
    rev = "v${version}";
    sha256 = "sha256-hBNfr620bI9snomEhTWsJEBXmqu4ihkA1bqzpq8fIHw=";
  };

  npmDepsHash = "sha256-bO8BbID9TyObs88ubY0yfjUi2zV3wvBTmOC3/90UDSM=";

  # Useful for debugging, just run "nix-shell" and then "electron ."
  nativeBuildInputs = [
    electron
  ];

  # Otherwise it will try to run a build phase (via npm build) that we don't have or need, with an error:
  # Missing script: "build"
  # This method is used in pkgs/by-name/in/indiepass-desktop/package.nix
  dontNpmBuild = true;

  # Needed, otherwise you will get an error:
  # RequestError: getaddrinfo EAI_AGAIN github.com
  env = {
    ELECTRON_SKIP_BINARY_DOWNLOAD = 1;
  };

  postPatch = ''
    mv src/{*,.*} .
    rmdir src/
    export RUST_BACKTRACE=1
  '';

  forceEmptyCache = true;

  postInstall = ''
    makeWrapper ${electron}/bin/electron $out/bin/${pname} \
      --add-flags $out/lib/node_modules/${pname}/main.js
  '';

}