BUGFIX Fixed SiteTree::page_type_classes() removal of base class (was…

… broken if database driver returned classes in arbitrary order, e.g. in Postgres)

git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/branches/2.4@102026 467b73ca-7a2a-4603-9d3b-597d59a354a9

core/model/SiteTree.php

@@ -301,7 +301,8 @@ public static function get_by_link($link, $cache = true) {
 	 */
 	public static function page_type_classes() {
 		$classes = ClassInfo::getValidSubClasses();
-		array_shift($classes);
+		if($baseClassIndex = array_search('SiteTree', $classes)) unset($classes[$baseClassIndex]);
+
 		$kill_ancestors = array();
 
 		// figure out if there are any classes we don't want to appear
@@ -324,7 +325,7 @@ public static function page_type_classes() {
 				unset($classes[$idx]);
 			}
 		}
-		
+
 		return $classes;
 	}