Prevent fatal error on fresh install

version.php

@@ -33,8 +33,13 @@ $module->component = 'mod_attendance';
 // TODO: remove this asap.
 if (defined('MOODLE_INTERNAL')) { // Only run if config.php has already been included.
     global $DB;
+    try {
         if ($DB->record_exists('modules', array('name' =>'attforblock'))) {
             require_once('locallib.php');
             attforblock_upgrade();
         }
+    } catch (Exception $e) {
+        // Probably a fresh install - modules table doesn't exist
+    }
+
 }