master e8db980: Don't bug out in gnus-icalendar when there no recurring event

[Lars Ingebrigtsen]

branch: master
commit e8db980dcb50bf1883b3d456a8e070baae83a2d7
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Don't bug out in gnus-icalendar when there no recurring event
    
    * lisp/gnus/gnus-icalendar.el
    (gnus-icalendar-event:recurring-days): Fix previous patch
    (bug#43038) -- don't bug out when there's no recurring event.
---
 lisp/gnus/gnus-icalendar.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/gnus/gnus-icalendar.el b/lisp/gnus/gnus-icalendar.el
index f13d4de..da41b08 100644
--- a/lisp/gnus/gnus-icalendar.el
+++ b/lisp/gnus/gnus-icalendar.el
@@ -148,7 +148,7 @@
                        ("TH" . 4)
                        ("FR" . 5)
                        ("SA" . 6))))
-    (when (string-match "BYDAY=\\([^;]+\\)" rrule)
+    (when (and rrule (string-match "BYDAY=\\([^;]+\\)" rrule))
       (let ((bydays (split-string (match-string 1 rrule) ",")))
         (seq-map
          (lambda (x) (cdr (assoc x weekday-map)))