Tests failing on PHP 8.1: strip_tags(): Passing null to parameter #1 ($string) of type string is deprecated

Problem/Motivation

1) Drupal\Tests\json_feed\Functional\DisplayJsonFeedTest::testFeedOutput
Exception: Deprecated function: strip_tags(): Passing null to parameter #1 ($string) of type string is deprecated
Drupal\json_feed\Plugin\views\row\JsonFeedFields->render()() (Line: 222)

Steps to reproduce

Run tests with PHP 8.1

Proposed resolution

Resolve Dependency.