compatibility with older version, allow NULL as message #2083
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Real use case in zend-mail: https://github.com/zendframework/zend-mail/blob/master/test/Header/SenderTest.php#L50
For now, zend-mail test suite pass with 4.8 but fails with 5.2
This PR restore compatibility (even if this method is deprecated)