Authenticate box appears when the logged in user is deleted

[dpakach]

Steps to reproduce

1. create a new user and login
2. delete the logged-in user
3. Reload the page as logged in user

Expected behavior

1. The user should be redirected to the login page or an error page

Actual behavior

1. An authentication popup appears

note I'm not sure if the is a correct behavior or bug, just noticed this while adding test for owncloud/ocis#1129

[pascalwengerter]

For future reference: We ran into a similar issue too today in the acceptance tests, getting a basic auth popup visible in the VNC client. Here's what happened:

We had a chained method on an unresolved promise
which somehow results in the user getting logged out on the backend
which results in the backend asking for authentication (which is the popup shown here)

[kulmann]

With #7072 being merged you'll get redirected to a login error page in the described scenario. Which includes a link to re-login with a different user.