Git commits in Moodle 1.7.4 by poltawski

commit 137c04383f6d1687495c4ec573f3cf4f273fe5bf
Author: poltawski <poltawski>
Date:   Thu, 10 Jan 2008 00:44:45 +0900
Tag:    v1.7.4

MDL-12889 - fix bad invalid capability check backported from MOODLE_18_STABLE