[Php71] Skip iterable on CountOnNullRector

[samsonasik]

Given the following code:

final class SkipOnIterable
{
    private function findAll(): iterable
    {
        return [];
    }

    public function run()
    {
        return count($this->findAll());
    }
}

It currently produce:

-        return count($this->findAll());
+        return is_array($this->findAll()) || $this->findAll() instanceof \Countable ? count($this->findAll()) : 0;

which should be skipped.

[samsonasik]

Fixed 🎉

[samsonasik]

All checks have passed 🎉 @TomasVotruba it is ready for review.

[TomasVotruba]

Thanks 👏