fix: error when mapping from stdClass to constructor with nullable/optional arguments

[MrMeshok]

I was trying to understand why generated code looks weird when mapping from array/stdClass to class which has constructor with nullable/optional arguments.
NullableTransformer is not supposed to be applied when creating from constructor because nullable/optional already handled.

With this fix, generated code instead of looking like this:

$value_1 = null;
if (null !== $value->ResponseDescription) {
    $value_1 = $value->ResponseDescription;
}
$constructarg_1 = $value_1 ?? NULL;

Look like this:

$constructarg_1 = $value->ResponseDescription ?? NULL;

Which also fixes #181

[Korbeil]

Thanks @MrMeshok for this fix, it looks nice ! ✔️ Could you also add a note in the CHANGELOG about your change please ? 🙏

[MrMeshok]

@Korbeil Done. Can you merge it today? I am working on another PR and don't want to deal with conflicts in CHANGELOG😁

[Korbeil]

@MrMeshok merged, thanks for your contribution ! 🙏

[MrMeshok]

@Korbeil I got regression errors after this fix with classes that have nullable objects as arguments. I'm working on fix and tests for this