Pull request with conflicts/errors that are merged using API returns unreadable error.

Summary

• When executing the API [/2.0/repositories/ {username}

  /

  {repo_slug}

  /pullrequests/#/merge], if there are errors with the merge, it returns with an unreadable error.

{
  "type": "error",
  "error": {
    "message": "<django.utils.functional.__proxy__ object at 0xcbce310>"
  }
}