minor #32153 Make Symfony\Component\Debug\ExceptionHandler::setFileLinkFormat accept Null as a return type (jls-esokia)
minor #32153 Make Symfony\Component\Debug\ExceptionHandler::setFileLinkFormat 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 type

fixes #32150

| Q             | A
| ------------- | ---
| Branch?       | master <!-- see below -->
| Bug fix?      | yes
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://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 people
understand your PR and can be used as a start for the documentation.

Additionally (see https://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
-------

e6cb7d866a Remove return type from ExceptionHandler::setFileLinkFormat

mweimerskirch/symfony,derrabus/symfony,romaricdrigon/symfony,Deamon/symfony,nicolas-grekas/symfony,shieldo/symfony,Tobion/symfony,zorn-v/symfony,mweimerskirch/symfony,lyrixx/symfony,ro0NL/symfony,smatyas/symfony,yceruto/symfony,symfony/symfony,oleg-andreyev/symfony,Deamon/symfony,ogizanagi/symfony,OskarStark/symfony,localheinz/symfony,fabpot/symfony,docteurklein/symfony,shieldo/symfony,Slamdunk/symfony,1ed/symfony,damienalexandre/symfony,teohhanhui/symfony,yceruto/symfony,nicolas-grekas/symfony,oleg-andreyev/symfony,sgehrig/symfony,smatyas/symfony,pierredup/symfony,stof/symfony,Tobion/symfony,Slamdunk/symfony,jakzal/symfony,maidmaid/symfony,nicolas-grekas/symfony,ragboyjr/symfony,curry684/symfony,d-ph/symfony,jderusse/symfony,jderusse/symfony,arjenm/symfony,ogizanagi/symfony,phramz/symfony,mweimerskirch/symfony,phramz/symfony,gonzalovilaseca/symfony,paradajozsef/symfony,mpdude/symfony,symfony/symfony,teohhanhui/symfony,garak/symfony,lstrojny/symfony,bendavies/symfony,localheinz/symfony,Simperfit/symfony,nicolas-grekas/symfony,xabbuh/symfony,curry684/symfony,derrabus/symfony,curry684/symfony,damienalexandre/symfony,jderusse/symfony,localheinz/symfony,docteurklein/symfony,paradajozsef/symfony,dmaicher/symfony,alekitto/symfony,ro0NL/symfony,oleg-andreyev/symfony,OskarStark/symfony,docteurklein/symfony,Slamdunk/symfony,shieldo/symfony,ragboyjr/symfony,lstrojny/symfony,xabbuh/symfony,tucksaun/symfony,pyrech/symfony,derrabus/symfony,alekitto/symfony,jvasseur/symfony,chalasr/symfony,stof/symfony,1ed/symfony,paradajozsef/symfony,kbond/symfony,smatyas/symfony,HeahDude/symfony,yceruto/symfony,gonzalovilaseca/symfony,lyrixx/symfony,stof/symfony,curry684/symfony,romaricdrigon/symfony,Simperfit/symfony,fabpot/symfony,MatTheCat/symfony,mnapoli/symfony,Deamon/symfony,gonzalovilaseca/symfony,MatTheCat/symfony,smatyas/symfony,tgalopin/symfony,garak/symfony,pyrech/symfony,chalasr/symfony,chalasr/symfony,stof/symfony,mnapoli/symfony,ro0NL/symfony,jakzal/symfony,hhamon/symfony,HeahDude/symfony,teohhanhui/symfony,hhamon/symfony,tgalopin/symfony,sgehrig/symfony,zorn-v/symfony,dmaicher/symfony,MatTheCat/symfony,Koc/symfony,ro0NL/symfony,Nyholm/symfony,sgehrig/symfony,smatyas/symfony,mnapoli/symfony,Deamon/symfony,pierredup/symfony,Nyholm/symfony,garak/symfony,HeahDude/symfony,jderusse/symfony,Deamon/symfony,ogizanagi/symfony,Koc/symfony,d-ph/symfony,xabbuh/symfony,kbond/symfony,arjenm/symfony,phramz/symfony,dmaicher/symfony,pyrech/symfony,Koc/symfony,fabpot/symfony,OskarStark/symfony,lyrixx/symfony,d-ph/symfony,maidmaid/symfony,tgalopin/symfony,mweimerskirch/symfony,teohhanhui/symfony,pyrech/symfony,lyrixx/symfony,phramz/symfony,gonzalovilaseca/symfony,voronkovich/symfony,Simperfit/symfony,zorn-v/symfony,ragboyjr/symfony,mweimerskirch/symfony,xabbuh/symfony,yceruto/symfony,Simperfit/symfony,damienalexandre/symfony,pierredup/symfony,HeahDude/symfony,sgehrig/symfony,docteurklein/symfony,tgalopin/symfony,mpdude/symfony,jakzal/symfony,bendavies/symfony,shieldo/symfony,jvasseur/symfony,Simperfit/symfony,mnapoli/symfony,hhamon/symfony,kbond/symfony,OskarStark/symfony,tucksaun/symfony,ogizanagi/symfony,alekitto/symfony,docteurklein/symfony,bendavies/symfony,jakzal/symfony,maidmaid/symfony,voronkovich/symfony,romaricdrigon/symfony,hhamon/symfony,mpdude/symfony,maidmaid/symfony,tucksaun/symfony,arjenm/symfony,symfony/symfony,1ed/symfony,Nyholm/symfony,MatTheCat/symfony,1ed/symfony,bendavies/symfony,garak/symfony,jvasseur/symfony,derrabus/symfony,dmaicher/symfony,symfony/symfony,fabpot/symfony,romaricdrigon/symfony,Tobion/symfony,pierredup/symfony,kbond/symfony,arjenm/symfony,localheinz/symfony,damienalexandre/symfony,voronkovich/symfony,Nyholm/symfony,mnapoli/symfony,jvasseur/symfony,zorn-v/symfony,Koc/symfony,tucksaun/symfony,Slamdunk/symfony,oleg-andreyev/symfony,d-ph/symfony,lstrojny/symfony,ragboyjr/symfony,paradajozsef/symfony,chalasr/symfony,voronkovich/symfony,alekitto/symfony,Tobion/symfony,mpdude/symfony