if (group !=null) {  paramGroupOwnedHash.add(group); return group; } else { Log.warn("in Structure.addParamGroup(). ParameterGroup passed in is null"); return null; }
paramGroupOwnedHash.add(group); return group;
  public ParameterGroup addParamGroup (ParameterGroup group) {    if (group !=null) {      //add the group to the groupOwnedHash      paramGroupOwnedHash.add(group);      return group;    }    else {      Log.warn("in Structure.addParamGroup(). ParameterGroup passed in is null");      return null;    }  }