org.el (org-refresh-properties): Don't throw an error when reaching the end of the buffer

* org.el (org-refresh-properties): Don't throw an error when
reaching the end of the buffer.

lisp/org.el

@@ -9290,7 +9290,7 @@ property to set."
 	   (save-excursion
 	     (org-back-to-heading t)
 	     (put-text-property
-	      (point-at-bol) (outline-next-heading) tprop p))))))))
+	      (point-at-bol) (or (outline-next-heading) (point-max)) tprop p))))))))
 
 
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