public static boolean isNull(final Object model,final String columnName){
  if (model == null) {
    return true;
  }
 else   if (GridTabWrapper.isHandled(model)) {
    return GridTabWrapper.isNull(model,columnName);
  }
 else   if (POWrapper.isHandled(model)) {
    return POWrapper.isNull(model,columnName);
  }
 else {
    throw new AdempiereException("Model wrapping is not supported for " + model + " (class:"+ model.getClass()+ ")");
  }
}

public static boolean isNull ( final Object model , final String columnName ) { if ( model == null ) { return true ; } else if ( GridTabWrapper . isHandled ( model ) ) { return GridTabWrapper . isNull ( model , columnName ) ; } else if ( POWrapper . isHandled ( model ) ) { return POWrapper . isNull ( model , columnName ) ; } else { throw new AdempiereException ( "Model wrapping is not supported for " + model + " (class:" + model . getClass ( ) + ")" ) ; } }
check if given columnname ' s value is null
