[offlineimap] downloading junk messages raise socket error with "copy message list.remove(x): x not in list" (#198)

[Valentin Lab]

FYI, I can reproduce the bug quite reliably by forcing an error on Dovecot server side (for instance by changing the permission of a mail in the Maildir storage of the server). This force an error on the server side to a query of offline imap, and this makes it fail with the same messages than above.
So it seems that the cleanup code after an exception is bugged and try to remove twice the same connection.

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https://github.com/OfflineIMAP/offlineimap/issues/198#issuecomment-153973236
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