python – GitLab API – GET Merge request JSON format

I’m getting my merge requests with this command:

curl --request GET--header "PRIVATE-TOKEN: <your_access_token>" ""

And I get my merge request from GitLab like:

  "id": 1,
  "iid": 1,
  "project_id": 3,
  "title": "test1",
  "description": "fixed login page css paddings",
  "state": "merged",
  "created_at": "2017-04-29T08:46:00Z",
  "updated_at": "2017-04-29T08:46:00Z",
  "target_branch": "master",
  "source_branch": "test1",
  "upvotes": 0,
  "downvotes": 0,
  "author": {
    "id": 1,
    "name": "Administrator",
    "username": "admin",
    "state": "active",
    "avatar_url": null,
    "web_url" : ""

My problem is, that my code needs a JSON without null’s instead I need None. I know I can replace it but how can I do that, if I cant save this merge request in a variable because of the errors I get.