code: public static void validateNotEmpty( Properties propertiesToCheck, String argumentName )
          throws NullArgumentException
      {
          validateNotNull( propertiesToCheck, argumentName );
          if( propertiesToCheck.isEmpty() )
          {
              throw new NullArgumentException( argumentName + IS_EMPTY );
          }
      }
docs: Validates that the Properties instance is not null and that it has entries.
  
  @param propertiesToCheck The object to be tested.
  @param argumentName      The name of the object, which is used to construct the exception message.
  
  @throws NullArgumentException if the Properties instance is null or does not have any entries.