Send a request to any json-rpc route with a HTTP header
`Content-Type: application/json-rpc` but send non-json or
non-jsonrpc data in the body. The application crashes with
a 500 Internal Server Error instead of a 400 Bad Request one
closes odoo/odoo#124571
Closes: #122048
X-original-commit: a1b83b07996f3fe4744474ff4023a3a2ce17ac7f
Signed-off-by: Julien Castiaux (juc) <juc@odoo.com>