Ticket #21838: update-std-class.diff

wp-admin/includes/update.php

@@ -86 +86 @@
                 return sprintf( __( 'Version %s' ), $GLOBALS['wp_version'] );
 
         $cur = get_preferred_from_update_core();
+        if ( empty( $cur ) )
+                $cur = new stdClass;
+        
         if ( ! isset( $cur->current ) )
                 $cur->current = '';