[4.2] Breaking change in array_only

[tudor-gala]

Pull request #5746 introduced some breaking changes in array_only

BEFORE

array_only(['options' => []], 'options') // returns ['options' => []]
array_only(['options' => ['dummy' => 1]], 'options') // returns ['options' => ['dummy' => 1]]

AFTER

array_only(['options' => []], 'options') // returns []
array_only(['options' => ['dummy' => 1]], 'options') // returns []

[GrahamCampbell]

Ping @taylorotwell. This could lead to fatal errors for people.

[RomainLanz]

I test with the old code and I have the same issue.