Enable replying to an ical event even when not an attendee

* lisp/gnus/gnus-icalendar.el
(gnus-icalendar-event--build-reply-event-body): Display a warning
instead of barfing when user is missing from attendee list.

When the user identity is not present in the attendee list, an error
is triggered making replying to such an event impossible (the reply
message not being even composed).  This replaces it with a warning.
This is necessary because one may receive events that the organizer
did not set up well and it is up to the user to decide whether or not
to reply to them (bug#41723).
Copyright-paperwork-exempt: yes

diff --git a/lisp/gnus/gnus-icalendar.el b/lisp/gnus/gnus-icalendar.el
index 305e17fd8fcdac9d1c9ed53f684d77b2d05254c3..29d3e30780f71d83ce468adf9c2ae3ffc30652e8 100644 (file)
--- a/lisp/gnus/gnus-icalendar.el
+++ b/lisp/gnus/gnus-icalendar.el
@@ -312,7 +312,8 @@ status will be retrieved from the first matching attendee record."
 
       (unless (gnus-icalendar-find-if (lambda (x) (string-match "^ATTENDEE" x))
                                      reply-event-lines)
-        (error "Could not find an event attendee matching given identity"))
+        (lwarn 'gnus-icalendar :warning
+               "Could not find an event attendee matching given identity"))
 
       (mapconcat #'identity `("BEGIN:VEVENT"
                               ,@(nreverse reply-event-lines)