Ticket #40659: 40659.2.patch

src/wp-admin/includes/class-wp-terms-list-table.php

@@ -501 +501 @@
          * @return string
          */
         public function column_description( $tag ) {
-                return $tag->description;
+                if ( ! empty( $tag->description ) ) {
+                        return $tag->description;
+                } else {
+                        return _x( 'No description' );
+                }
         }
 
         /**