Passing NULL to Unicode::truncate() in MenuParentSelectorForm causes deprecations on PHP 8.1

Created a patch for the issue mentioned, please review.
Thank You.

How are you adding a menu item without a title when it's a required field?

Also these kind of issues just slapping an is_null check isn't usually the best approach. This could be a different issue and it's just being covered up.

Added a patch with interdiff to #3, adding Untitled as title when title is not present.

@rckstr_rohan thank you for the interest but you've been working on a number of these tickets now. Adding just a check isn't usually a good solution. As it could be hiding a deeper issue.

If steps are not provided to reproduce that will be needed. #4 you'll see I asked for clarity on the steps.

As a bug it will need a test case.

Please do some checks before putting into review.

Thanks