[Mailer] [MailPace] Fix undefined array key in errors response #50515
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This PR fixes a bug which occurs when MailPace returns an
errors
response instead oferror
(see https://docs.mailpace.com/reference/responses/ for possible responses).Without this fix, the
errors
response leads to the following exception:ErrorException: Undefined array key "error"
I added two tests to verify that:
To fix the bug I added a check for the existence of the
error
/errors
key in the$result
variable and a fallback just in case that both are not present.