[TypeDeclarationDocblocks] Handle crash on next empty array on ClassMethodArrayDocblockParamFromLocalCallsRector

[samsonasik]

Given the following code:

class NotZeroPosition
{
    public function go()
    {
        $this->run([], ['item1', 'item2']);
    }

    private function run(array $data, array $items)
    {
    }
}

It cause crash:

message": "System error: \"Call to a member function isNull() on null

There was 1 error:

1) Rector\Tests\TypeDeclarationDocblocks\Rector\Class_\ClassMethodArrayDocblockParamFromLocalCallsRector\ClassMethodArrayDocblockParamFromLocalCallsRectorTest::test with data set #10 ('/home/runner/work/rector-src/...hp.inc')
Error: Call to a member function isNull() on null

see https://getrector.com/demo/4e14f065-f5fc-4aa6-87c9-6579a05f4769

This PR fix it.

[samsonasik]

Fixed 🎉 /cc @TomasVotruba

[samsonasik]

All checks have passed 🎉 @TomasVotruba I am merging it ;)

[TomasVotruba]

Great job 👍