if (experiment == null) return null;
if (experiment == null || !usingExperiment) return null;
  protected Object getHostPropertyValue(String hostName, String propertyName) {    if (experiment == null) return null;    HostComponent[] hosts = experiment.getHostComponents();    for (int i = 0; i < hosts.length; i++) {      String s = hosts[i].getShortName();      if (s.equals(hostName))        return getPropertyValue(hosts[i], propertyName);    }    return null;  }