Revert "minor #12652 [HttpFoundation] [Hackday] #9942 test: Request::getContent() for null value (skler)"
Revert "minor #12652 [HttpFoundation] [Hackday] #9942 test: Request::getContent() for null value (skler)"

This reverts commit 09225c7466e5da18990b808d82f1a635ed2f2341, reversing
changes made to a0298331ad7196f2fb2c600ba7b81654f1913fc6.

ygerasimov/HttpFoundation,oswaldderiemaecker/HttpFoundation,symfony/HttpFoundation,mneuhaus/HttpFoundation,symfony/http-foundation,nichdu/HttpFoundation