fixed some small errors

Author: rtschu

Diff for: classes/search/moodleoverflowposts.php

@@ -100,6 +100,9 @@ private function get_moodleoverflow_from_id($moodleoverflowid) {
     public function check_access($id) {
         try {
             $post = moodleoverflow_get_post_full($id);
+            if (!$post) {
+                return \core_search\manager::ACCESS_DELETED;
+            }
             if (!$discussion = $this->get_discussion_from_id($post->discussion)) {
                 return \core_search\manager::ACCESS_DELETED;
             }

Diff for: locallib.php

@@ -473,7 +473,7 @@ function moodleoverflow_get_post_full($postid) {
     $params['postid'] = $postid;
 
     $post = $DB->get_record_sql($sql, $params);
-    if ($post->userid === 0) {
+    if (isset($post->userid) && $post->userid === 0) {
         $post->message = get_string('privacy:anonym_post_message', 'mod_moodleoverflow');
     }