R1:8af2f0d755a2

Fix undefined property in Amazon SES

Summary:
When sending an email through ses, the body property on the response object is not set, throwing a notice. This causes the system to assume a messsage failure, and requeues the email.

As the email is actually delivered, it causes an email bomb :(

Message Undefined property: stdClass::$body
#0 /sidekick/phabricator/phabricator/externals/amazon-ses/ses.php(571): PhutilErrorHandler::handleError(8, 'Undefined prope...', '/sidekick/phabr...', 571, Array)
#1…