Updated AbstractOrder.php to return null instead of false in getShippingStatus() when the shipping
status is not set. This makes the method's behaviour more consistent.

Updated Search.php to add a condition check for class existence before retrieving shipping status.
This ensures that the code will not fail if the class is not defined.

Modified DataLayer.php to add a condition check for class existence before retrieving shipping.

Added @phpstan-ignore-next-line in Utils.php to silence phpstan for the next line of code.

Related: #172