Bug 1062728 - [email/pop3] POP3 sync breaks on messages that lack a Date header. r=mcav

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/340
Merge pull request #24412 from asutherland/email-pop3-no-date

Bug 1062728 - [email/pop3] POP3 sync breaks on messages that lack a Date header. r=mcav