make project description optional

[julianfbeck]

Hey,
Thanks for building this awesome type safe client!
I just found out that the project description can be null: https://docs.gitlab.com/ee/api/projects.html

 {
    "id": 4,
    "description": null,
    "name": "Diaspora Client",
    "name_with_namespace": "Diaspora / Diaspora Client",
    "path": "diaspora-client",
    "path_with_namespace": "diaspora/diaspora-client",
    "created_at": "2013-09-30T13:46:02Z",
    "default_branch": "main",
    "tag_list": [
      "example",
      "disapora client"
    ],
    "topics": [
      "example",
      "disapora client"
    ],
    "ssh_url_to_repo": "git@gitlab.example.com:diaspora/diaspora-client.git",
    "http_url_to_repo": "https://gitlab.example.com/diaspora/diaspora-client.git",
    "web_url": "https://gitlab.example.com/diaspora/diaspora-client",
    "avatar_url": "https://gitlab.example.com/uploads/project/avatar/4/uploads/avatar.png",
    "star_count": 0,
    "last_activity_at": "2013-09-30T13:46:02Z",
    "namespace": {
      "id": 2,
      "name": "Diaspora",
      "path": "diaspora",
      "kind": "group",
      "full_path": "diaspora",
      "parent_id": null,
      "avatar_url": null,
      "web_url": "https://gitlab.example.com/diaspora"
    }
  },

[DavidBrunow]

We've run into this as well, would love to see it merged!

[J0s34h]

Same, can u merge this @malcommac ?