Currently the ObjectMapper cannot support empty constructor initialization, which is particularly useful for Doctrine collections:

class Article
{
    #[ORM\ManyToMany(targetEntity: Tag::class)]
    private Collection $tags;

    public function __construct()
    {
        $this->tags = new ArrayCollection();
    }

    public function addTag($tag)
    {
         // ...
    }

    public function removeTag($tag)
    {
         // ...
    }
}

This kind of error is thrown by the PropertyAccessor:

Symfony\Component\PropertyAccess\Exception\UninitializedPropertyException: The property "Symfony\Component\ObjectMapper\Tests\Fixtures\InitializedConstructor\B::$tags" is not readable because it is typed "array". You should initialize it or declare a default value instead.

This PR fixes this but also another related issue (#60807): since an "empty" (no constructor arguments) constructor is always called, the class-level transformation test does not pass anymore:

Symfony\Component\ObjectMapper\Tests\ObjectMapperTest::testMapToWithInstanceHook
ArgumentCountError: Too few arguments to function Symfony\Component\ObjectMapper\Tests\Fixtures\InstanceCallback\B::__construct(), 0 passed in /home/workspace/symfony/symfony/src/Symfony/Component/ObjectMapper/ObjectMapper.php on line 151 and exactly 1 expected

To solve this, a check is done on map?->transform.