code: public static <T, K> void isNullOrEmpty(Map<T, K> map, String message) {
  
  		isTrue(map == null || map.size() == 0, message);
  	}
docs: Tests if map is null or empty
  
  @param map     must be null or empty
  @param message to return in exception
  @param <T>     object type
  @param <K>     value type
  @throws IllegalArgumentException if list != null or list.size() greater than 0