[Mailer][Mailchimp Bridge] Throwing undefined index _id when setting message id#34599

Merged

fabpot merged 1 commit intosymfony:4.4from

monteiro:fix/mandrill-http-transport-undefined_id_4.4

Nov 26, 2019

Commits on Nov 25, 2019

mailer: mailchimp bridge is throwing undefined index _id when setting message id in mandrill http transport
monteiro
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