Need to add a check for model variable is null

[superkolya]

repos/src/ArrayRepository.php

Line 79 in 5042d01

$this->data->put($model[$this->idField], array_merge($model, $data));

I think need to add a check for model variable is null, because judging by the documentation method get can return null. @artem-prozorov, if you agree I can do it after merge #15

[artem-prozorov]

Sure, create a PR