A sentence in the docs for the property parameter should say something about possibly missing graphs, due to the reasons explained in the docs for the augment parameter. See http://groups.google.com/group/sage-devel/browse_thread/thread/e8516faf818a6fb7
Component: documentation
Author: Douglas McNeil
Reviewer: Nathann Cohen, Dmitrii Pasechnik
Merged: sage-4.7.2.rc0
Issue created by migration from https://trac.sagemath.org/ticket/6210