otherwise callback not getting executed

Hi All,

I am trying to handle a exception "Duplicate key 'OperatorTypeParameter'", however, my otherwise callback does not get executed, I also tried to add a try / catch but even in that case it does not work.

try {
  workbook.getParametersAsync().then(function(parameter) {}).otherwise(function(err) {
    try {
      console.log(err);
    } catch(e) {
      console.log(e)
    }
  });
} catch(e) {
  console.log(e)
}

Not sure it its a bug. Any help in this would be really great.

Thanks.