code: public static String toStringWithDefault(Object value, String defaultValue) {
  		String result = toNullableString(value);
  		return result != null ? result : defaultValue;
  	}
docs: Converts value into string or returns default when value is null.
  
  @param value        the value to convert.
  @param defaultValue the default value.
  @return string value or default when value is null.
  
  @see StringConverter#toNullableString(Object)