small change to fix gnus-icalendar to org export

[Eric S Fraga <e.fraga@ucl.ac.uk>]

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The attached patch will fix gnus-icalendar-event->org-entry to export an
event with timestamp correctly when no description field has been
specified in the calendar event.  A description field is optional so may
not be present.

This patch was suggested by Robert Pluim on the gnus mailing list.  I've
tested it out on a couple of calendar invites and seems to work just
fine.

Thanks,
eric

-- 
Eric S Fraga via Emacs 27.0.50 & org 9.2.3 on Debian buster/sid

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diff --git a/lisp/gnus/gnus-icalendar.el b/lisp/gnus/gnus-icalendar.el
index 28020a1fd0..64cc3f92a9 100644
--- a/lisp/gnus/gnus-icalendar.el
+++ b/lisp/gnus/gnus-icalendar.el
@@ -480,14 +480,14 @@ gnus-icalendar--format-participant-list
                 (org-entry-put (point) (car prop) (cdr prop)))
               props))
 
-      (when description
-        (save-restriction
-          (narrow-to-region (point) (point))
-          (insert (gnus-icalendar-event:org-timestamp event)
-                  "\n\n"
-                  description)
-          (indent-region (point-min) (point-max) 2)
-          (fill-region (point-min) (point-max))))
+      (save-restriction
+        (narrow-to-region (point) (point))
+        (insert (gnus-icalendar-event:org-timestamp event)
+                "\n\n")
+        (when description
+          (insert description))
+        (indent-region (point-min) (point-max) 2)
+        (fill-region (point-min) (point-max)))
 
       (buffer-string))))