Running Commitizen on `git commit` with cli script

I am trying to combine these two sections from docs:
[Running Commitizen on `git commit`](https://github.com/commitizen/cz-cli#optional-running-commitizen-on-git-commit) and [Commitizen for multi-repo projects](https://github.com/commitizen/cz-cli#commitizen-for-multi-repo-projects).

Repository to reproduce: https://github.com/arvigeus/commit
(configuration is in [packages/git-config](https://github.com/arvigeus/commit/tree/master/packages/git-config), cli is in [packages/git-config/conventional-commit.js](https://github.com/arvigeus/commit/blob/master/packages/git-config/conventional-commit.js), nothing special)

When I add a new file and try to commit it, I get the following error:

```sh
$ git commit
husky > pre-commit (node v10.19.0)
✔ Preparing...
✔ Running tasks...
✔ Applying modifications...
✔ Cleaning up...
husky > prepare-commit-msg (node v10.19.0)
/media/data/Workspace/arvigeus/commit/node_modules/commitizen/node_modules/cz-conventional-changelog/index.js:10
defaultType: process.env.CZ_TYPE || config.defaultType,
^

TypeError: Cannot read property 'defaultType' of undefined
at Object. (/media/data/Workspace/arvigeus/commit/node_modules/commitizen/node_modules/cz-conventional-changelog/index.js:10:46)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Module.require (internal/modules/cjs/loader.js:692:17)
at require (internal/modules/cjs/helpers.js:25:18)
at getPrompter (/media/data/Workspace/arvigeus/commit/node_modules/commitizen/dist/commitizen/adapter.js:1391:41)
at gitCz (/media/data/Workspace/arvigeus/commit/node_modules/commitizen/dist/cli/strategies/git-cz.js:62:18)
husky > commit-msg (node v10.19.0)
/media/data/Workspace/arvigeus/commit/node_modules/@commitlint/cli/lib/cli.js:124
throw err;
^

TypeError: Cannot read property 'length' of null
at exports.default (/media/data/Workspace/arvigeus/commit/node_modules/@commitlint/rules/lib/header-max-length.js:10:143)
at results.filter.map.entry (/media/data/Workspace/arvigeus/commit/node_modules/@commitlint/lint/lib/index.js:151:17)
at Array.map ()
at Object. (/media/data/Workspace/arvigeus/commit/node_modules/@commitlint/lint/lib/index.js:131:7)
at process._tickCallback (internal/process/next_tick.js:68:7)
husky > commit-msg hook failed (add --no-verify to bypass)
```

Beginne mit den verlinkten Dokumentationsabschnitten und dem bereitgestellten Repository, insbesondere mit packages/git-config/conventional-commit.js, und reproduziere dann den Fehler mit git commit. Als erledigt gilt die Aufgabe, wenn das kombinierte Setup aus mehreren Repositorys und git commit ohne den Fehler mit dem undefinierten defaultType und den anschließenden commitlint-Absturz ausgeführt wird.

Vom Indexierungsmodell aus dem Issue-Text verfasst.