[BUG] Contributions page gives (auth) error

[justb4]

NOTE: server is running from the osm-es-4.7.0-login-fix branch! See PR #1 .

Describe the bug
Best see screenshot.

To Reproduce
Steps to reproduce the behavior:
When logged in:

1. Go to tareas.openstreetmap.es/contributions
2. See error

Expected behavior
Should see contributions.

Screenshots

Desktop (please complete the following information):

• OS: any
• Browser any

Additional context
It looks related to the fix. The file 'GenericJSONRequest'.

[justb4]

Looks like the if check is not right: (?)

Code jumps from 11 to function end.

[justb4]

Ha I think the check for init also needs to cater for init === false. Maybe that will solve.

[justb4]

Think needs fix to check if init is Object:

export function fetchExternalJSONAPI(url, init = {}) {
  if (!init instanceof Object) { // <=======
    init = {};
  }
  if (!init.headers) {
    init.headers = { 'Content-Type': 'application/json' };
  }
  init.headers['Content-Type'] = 'application/json';

  return fetch(url, {
    method: 'GET',
    ...init,
  })
    .then(handleErrors)
    .then((res) => {
      return res.json();
    });
}

[justb4]

This has been a known, and fixed, issue in the core TM. Will look into more cherry-picking with a new PR from this commit:
hotosm@56da86b
But will first merge PR #1 such that we start from working version.