Some returned responses end with ')' rather than 'UID XXX)' as expected.
BTW, a better policy could be to request for the 'X-OfflineIMAP' header only
rather than fetching all the headers and looking for it manually.
Also:
- Strip the output when error occurs: we don't need the full response unless
'imap' debug mode is enabled.
- Improve the comments.
Github-ref: https://github.com/OfflineIMAP/offlineimap/issues/479
Tested-by: https://github.com/secomi
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
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