Sp8.sc1.save users with no password

As far as I know, the backend has an issue deleting the user's password. That means, when the frontend is launched, it can't get the collection of users in ES and keep them also locally, because the insertion fails.

This pull request is a hotfix in order to prevent users click on streams which belong to an non-existing user, making the whole app crashes.

If the backend issue is fixed, then we should remove this because it's basically a hack