/// <summary>
/// Returns the properties value parsed as T.
/// If the parameter does not exists or can not be parsed to a T, returns an Empty Optional
/// </summary>
/// <param name="parameter"></param>
/// <returns></returns>
public Optional <T> GetOptional <T>(string parameter)
{
return(GetOptional(parameter).FlatMap(x => ParseUtil.ParseSave <T>(x)));
}
