Issue with cardinality

Problem/Motivation

After update drupal to the 10.3.10 and Autocomplete Deluxe to 2.1 there is an issue "Warning: Undefined array key "#cardinality" in Drupal\autocomplete_deluxe\Element\AutocompleteDeluxeElement::processElement() (line 115 of modules/contrib/autocomplete_deluxe/src/Element/AutocompleteDeluxeElement.php)."

Steps to reproduce

go to a content with a reference field and autocomplete deluxe formater

Proposed resolution

add a test on each key (basic) before use it

Remaining tasks

• ✅ File an issue
• ➖ Addition/Change/Update/Fix
• ➖ Testing to ensure no regression
• ➖ Automated unit testing coverage
• ➖ Automated functional testing coverage
• ➖ UX/UI designer responsibilities
• ➖ Readability
• ➖ Accessibility
• ➖ Performance
• ➖ Security
• ➖ Documentation
• ➖ Code review by maintainers
• ➖ Full testing and approval
• ➖ Credit contributors
• ➖ Review with the product owner
• ➖ Release notes snippet
• ❌ Release

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• N/A