[PATCH] org.el: fix org--get-outline-path-1

[Tobias Getzner <tobias.getzner@gmx.de>]

Headline titles may be empty, in which case the respective match group
will be nil. This would throw an error when trying to regexp-replace
checkbox cookies.

TODO: Depending on preference, a place-holder string might be a better
choice (for user-display) rather than leaving the outline-path element empty.
---
 lisp/org.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/org.el b/lisp/org.el
index 3e2f1c1..f45b9fc 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -11611,7 +11611,7 @@ (defun org--get-outline-path-1 (&optional use-cache)
                             ;; Remove statistical/checkboxes cookies.
                             (replace-regexp-in-string
                              "\\[[0-9]+%\\]\\|\\[[0-9]+/[0-9]+\\]" ""
-                             (org-match-string-no-properties 4))))))
+                             (or (org-match-string-no-properties 4) ""))))))
        (if (org-up-heading-safe)
            (let ((path (cons heading (org--get-outline-path-1 use-cache))))
              (when use-cache
-- 
2.7.2