fix: fallback for missing packument.versions

[chernodub]

Object.keys will throw if nullish value is provided. I faced the error when tried to install deps from our internal registry. This caused the following error:

10300 verbose stack TypeError: Cannot convert undefined or null to object
10300 verbose stack     at Function.keys (<anonymous>)
10300 verbose stack     at module.exports (~/node/18.17.0/lib/node_modules/npm/node_modules/npm-pick-manifest/lib/index.js:213:22)
10300 verbose stack     at RegistryFetcher.manifest (~/node/18.17.0/lib/node_modules/npm/node_modules/pacote/lib/registry.js:119:22)
10300 verbose stack     at async Promise.all (index 12)
10300 verbose stack     at async #buildDepStep (~/node/18.17.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:1034:5)
10300 verbose stack     at async Arborist.buildIdealTree (~/node/18.17.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:196:7)
10300 verbose stack     at async Promise.all (index 1)
10300 verbose stack     at async Arborist.reify (~/node/18.17.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/reify.js:159:5)
10300 verbose stack     at async Install.exec (~/node/18.17.0/lib/node_modules/npm/lib/commands/install.js:147:5)
10300 verbose stack     at async module.exports (~/node/18.17.0/lib/node_modules/npm/lib/cli.js:89:5)

When I added the fallback, the error rendered fine and I was able to figure out what caused the problem:

Error example after the fix:

npm verb stack internal-package: No matching version found for internal-package@1.3.2.
npm verb stack     at module.exports (~/18.17.0/lib/node_modules/npm/node_modules/npm-pick-manifest/lib/index.js:209:23)
npm verb stack     at RegistryFetcher.manifest (~/18.17.0/lib/node_modules/npm/node_modules/pacote/lib/registry.js:119:22)
npm verb stack     at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
npm verb stack     at async Promise.all (index 12)
npm verb stack     at async #buildDepStep (~/18.17.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:1034:5)
npm verb stack     at async Arborist.buildIdealTree (~/18.17.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:196:7)
npm verb stack     at async Promise.all (index 1)
npm verb stack     at async Arborist.reify (~/18.17.0/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/reify.js:159:5)
npm verb stack     at async Install.exec (~/18.17.0/lib/node_modules/npm/lib/commands/install.js:147:5)
npm verb stack     at async module.exports (~/18.17.0/lib/node_modules/npm/lib/cli.js:89:5)
npm verb cwd /Users/user/internal-app
npm verb Darwin 21.6.0
npm verb node v18.17.0
npm verb npm  v9.6.7
npm ERR! code ETARGET
npm ERR! notarget No matching version found for internal-package@1.3.2.
npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.
npm verb exit 1

Closes #79

[wraithgar]

Seems pretty straightforward, but would need a test.

[chernodub]

@wraithgar thanks for reviewing this! I added a test for this.