"Return the stable query for the current region.
If ONLY-MATCHED is non-nil, include only matched messages. If it
-is nil, include both matched and unmatched messages."
+is nil, include both matched and unmatched messages. If there are
+no messages in the region then return nil."
(let ((query-list nil) (all (not only-matched)))
(dolist (queries (notmuch-search-properties-in-region :query beg end))
(when (first queries)
(push (first queries) query-list))
(when (and all (second queries))
(push (second queries) query-list)))
- (concat "(" (mapconcat 'identity query-list ") or (") ")")))
+ (when query-list
+ (concat "(" (mapconcat 'identity query-list ") or (") ")"))))
(defun notmuch-search-find-authors ()
"Return the authors for the current thread"