feat: OpenAPI: Allow null as parameter for Operation->withRequestBody (#4346)
feat: OpenAPI: Allow null as parameter for Operation->withRequestBody (#4346)

* feat: Allow null as parameter for Operation->withRequestBody

* default value to null

Co-authored-by: Antoine Bluchet <edcec09a562138adfb85c8fcbbe8d05b66f0d9b8@users.noreply.github.com>
vincentchalamon/core,api-platform/core,api-platform/core,vincentchalamon/core,soyuka/core,soyuka/core,soyuka/core,vincentchalamon/core,soyuka/core,vincentchalamon/core,api-platform/core,api-platform/core