whoops, make wp_list_pages not spew a warning when there are no pages

git-svn-id: https://develop.svn.wordpress.org/trunk@2360 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/template-functions-post.php

@@ -297,10 +297,12 @@ function get_pages($args = '') {
 		  "$exclusions " .
 		  "ORDER BY " . $r['sort_column'] . " " . $r['sort_order']);
 
+		$cache_pages = array();
+		if (count($pages)) {
 			foreach($pages as $page) {
 				$cache_pages[$page->ID] = $page;
 			}
-
+		}
 	}
 
 	return $cache_pages;