M2-97 - Fixed some "Passing null to parameter of type string is depre… #27
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…cated" problems for PHP 8.1 compatibility
When fixing compatibility for PHP 8.1 for the Ratepay Magento2 module some problems occured when a cdata parameter was filled with a null value. This was no problem before but with PHP 8.1 being very strict this resulted in a PHP warning which Magento2 converts into an exception.
With these changes the behaviour stays the same as before in PHP 8.1.