Fix filter null values when array does not start with 0 (#4937)
Fix filter null values when array does not start with 0 (#4937)

```php
[
    120 => ["order" => 1].
    240 => ["order" => 2],
]
```

That kind of data caused:
```
ErrorException
Undefined offset: 0
```

To be honest I cannot replicate at all the problem that #3350 PR was solving even totally removing the code, but I only changed it because it might happen in some occasion that I'm unable to reproduce.
the-control-group/voyager,the-control-group/voyager