var optionName = new Option(text, value, false, false);
optionName.setAttribute('data-can_discount', can_discount);
optionName.setAttribute('data-can_start_date', can_start_date);
- optionName.setAttribute('data-start_date', start_date);
+ optionName.setAttribute('data-start_date', start_date || '');
var length = what.length;
what.options[length] = optionName;
}