symfony/symfony — pull request #4583 by odolbeau (2012-06-15 08:44:18+00:00)
Title: LogoutSuccessHandler can now return null

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: yes

It's not required to return a Response from LogoutSuccessHandler anymore.
If null returned, continue with the default behavior.