[ archivemail-Bugs-3090802 ] Empty response from FETCH not handled gracefully

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Bugs item #3090802, was opened at 2010-10-19 20:16
Message generated for change (Tracker Item Submitted) made by nobody
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Empty response from FETCH not handled gracefully

Initial Comment:
When attempting to FETCH defatils for a particular message number, OpenText FirstClass IMAP may return an "empty" response.
It seems the current code does not handle that very well.

Example IMAP session with OpenText FirstClass:
. EXAMINE "INBOX/foobar"
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
* OK [PERMANENTFLAGS ()] Read-only mailbox.
* 3 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1100080522] UIDs valid
* OK [UIDNEXT 3] Predicted next UID
. OK [READ-ONLY] Select completed.
. FETCH 1:* (RFC822.SIZE)
* 1 FETCH (RFC822.SIZE 5120)
* 3 FETCH (RFC822.SIZE 2048)
. FETCH 2 (RFC822)
. OK FETCH Completed

When trying to archive such as mailbox using the current git version of archivemail, it fails like this:

  34:57.74 > KKFK128 FETCH 2 (FLAGS)
  34:57.77 < KKFK128 OK FETCH Completed
  34:57.77 	matched r'(?P<tag>KKFK\d+) (?P<type>[A-Z]+) (?P<data>.*)' => ('KKFK128', 'OK', 'FETCH Completed')
cleaning up ...
removing stale temporary mbox '/tmp/tmpwh4hnzarchivemail/tmp9HUS2s'
removing stale tempfile directory '/tmp/tmpwh4hnzarchivemail'
Traceback (most recent call last):
  File "archivemail", line 1822, in <module>
    main()
  File "archivemail", line 697, in main
    archive(mailbox_path)
  File "archivemail", line 1118, in archive
    _archive_imap(mailbox_name)
  File "archivemail", line 1379, in _archive_imap
    msg_flags = imaplib.ParseFlags(response[0])
  File "/usr/lib/python2.6/imaplib.py", line 1374, in ParseFlags
    mo = Flags.match(resp)
TypeError: expected string or buffer


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