Eloquent - where has pivot users orWhere has none

I'm trying to write a function that will get all "buckets" that are assigned to the auth'd user and/or buckets that have NO USERS assigned.

Relations and such, work as they should. Unless I'm missing something?

How can I get all buckets user is assigned too - and also include buckets where no users (including the auth user) are assigned.

1. Buckets user is assigned to
2. Buckets where NO users have been assigned. i.e. pivot table contains no rows for bucket, etc.

My issue very likely stems from the orWhere query...

$buckets = Team::currentTeam()->buckets()->with('user')->whereHas('user', function($query) {
    $query->where('user_id', Auth::user()->id)
    ->orWhere('user_id', function() {
        $query->count();
    }, '<', 0);
})->get();

via Chebli Mohamed