Gnus: Fix edge cases with no data being returned and Courier eccentricity.
* lisp/gnus/nnimap.el (nnimap-retrieve-headers-progress): Handle edge case where `headers' is nil. This can occur if the IMAP server does not have permissions to read messages from a folder, but can write new messages to the folder. (nnimap-request-article-part): Do not insert `data' if it is nil. * lisp/net/imap.el (imap-parse-fetch): Courier can insert spurious blank characters which will confuse `read', so skip past them.
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