Update Tests can't run with --die-on-fail

UpdatePathBase has the following code:

  /**
   * {@inheritdoc}
   */
  protected function rebuildAll() {
    parent::rebuildAll();

    // Remove the notices we get due to the menu link rebuild prior to running
    // the system updates for the schema change.
    foreach ($this->assertions as $key => $assertion) {
      if ($assertion['message_group'] == 'Notice' && basename($assertion['file']) == 'MenuTreeStorage.php' && strpos($assertion['message'], 'unserialize(): Error at offset 0') !== FALSE) {
        unset($this->assertions[$key]);
        $this->deleteAssert($assertion['message_id']);
        $this->results['#exception']--;
      }
    }
  }

Unfortunately this hack doesn't work when you use --die-on-fail.

The quick fix would be to add a try/catch around this.