Fixed query filters not working correctly on no item condition.
Fixed query filters not working correctly on no item condition.

Fixed filter by favorited failing when user had no favorites. Used to return all articles in this case.
Fixed filter by tag failing when a tag wasn't attached to any article. Used to return all articles in this case.

SandeeshS/laravel-realworld-example-app,SandeeshS/laravel-realworld-example-app