if (group == null) { Log.warn("in Structure.removeParamGroup().  ParameterGroup passed in is null"); return false; }
  public boolean removeParamGroup(ParameterGroup group) {    if (group == null) {      Log.warn("in Structure.removeParamGroup().  ParameterGroup passed in is null");      return false;    }    return paramGroupOwnedHash.remove(group);  }