[1.2.0] Allow configuration directives to permit null values. ConfigDoc updated accordingly.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@521 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/Error.php

@@ -0,0 +1,8 @@
+<?php
+
+/**
+ * Return object from functions that signifies error when null doesn't cut it
+ */
+class HTMLPurifier_Error {}
+
+?>