…nkFormat accept Null as a return type (jls-esokia)This PR was merged into the 5.0-dev branch.Discussion----------Make Symfony\Component\Debug\ExceptionHandler::setFileLinkFormat accept Null as a return typefixes#32150| Q             | A| ------------- | ---| Branch?       | master <!-- see below -->| Bug fix?      | yes| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->| BC breaks?    | no     <!-- seehttps://symfony.com/bc -->| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->| Fixed tickets |#32150    <!-- #-prefixed issue number(s), if any -->| License       | MIT| Doc PR        | - <!-- required for new features --><!--Replace this notice by a short README for your feature/bugfix. This will help peopleunderstand your PR and can be used as a start for the documentation.Additionally (seehttps://symfony.com/roadmap): - Bug fixes must be submitted against the lowest maintained branch where they apply   (lowest branches are regularly merged to upper ones so they get the fixes too). - Features and deprecations must be submitted against branch 4.4. - Legacy code removals go to the master branch.-->Make `Symfony\Component\Debug\ExceptionHandler::setFileLinkFormat` accept null as a return type.Since Symfony requires PHP 7.2+ and that PHP feature was introduced in 7.1, I use that feature instead of changing the default value of the variable.Commits-------e6cb7d8 Remove return type from ExceptionHandler::setFileLinkFormat