Fix bug with non-exist page

Fix the bug that occures when indexer returns non-exist page.

helper.php

@@ -31,11 +31,13 @@ function _get_page_data() {
         $all_pages = idx_get_indexer()->getPages();
         $pages = array();
         foreach($all_pages as $pageid) {
-            $pages[$pageid] = array("exists"=>1, "links"=>0);
+            $pages[$pageid] = array("exists"=>page_exists($pageid), "links"=>0);
         }      
 
         foreach($all_pages as $pageid) {
 
+            if (!page_exists($pageid)) continue;
+
             $relation_data = p_get_metadata($pageid)['relation']['references'];
             if (!is_null($relation_data)) {
                 foreach($relation_data as $name => $exist) {