Handle empty IMAP parts from Outlook.com servers #29
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Cherry-pick fix from upstream mailcore2 PR #1621.
Outlook.com IMAP server sometimes omits message parts and returns them as zero-length when there is a vCalendar part in the message. Previously this would cause a MAILIMAP_ERROR_FETCH error, failing the entire fetch.
This fix:
This allows messages with vCalendar attachments to be fetched successfully from Outlook.com accounts.
Upstream: MailCore/mailcore2#1621