Make sure cache is primed before use in get_category_children().

git-svn-id: http://svn.automattic.com/wordpress/trunk@2608 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/template-functions-category.php

@@ -124,6 +124,10 @@ function get_category_parents($id, $link = FALSE, $separator = '/', $nicename =
 
 function get_category_children($id, $before = '/', $after = '') {
 	global $cache_categories;
+
+	if ( ! isset($cache_categories))
+		update_category_cache();
+		
 	$c_cache = $cache_categories; // Can't do recursive foreach on a global, have to make a copy
 	$chain = '';
 	foreach ($c_cache as $category){