Solved Arr::stringToArray doesn't handle nulls gracefully

[Xon]

The Arr::stringToArray is used on potentially nullable inputs, but trim requires non-null inputs as of php 8.1


An example of triggering this is;
PHP:

                    /** @var \XF\Entity\ChangeLog $changeLog */
                    $changeLog = \XF::em()->create('XF:ChangeLog');
                    $changeLog->content_type = 'user';
                    $changeLog->content_id = 1;
//                    $changeLog->old_value = '';
                    $changeLog->new_value =...

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