test.js

var Promise = require('bluebird')

let myDelay = (ms) => {
  let milliseconds = ms;
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve();
    }, milliseconds)
  });
};

let demo = () => {
  console.log("Executing Demo")
  return Promise.try(() => {
    return new Promise((resolve, reject) => {
      reject("blah");
    });
  });
};

let superDemo = () => {
  return Promise.try( () => {
    return demo().catch( (err) => {
        console.log("Error caught: ", err);
        return myDelay(1000).then(() => {
          console.log("Retrying Demo");
          return demo();
        });
      });
    });
};

Why does calling superDemo() result in an unhandled rejection error?

> superDemo()
Executing Demo
Promise {
  _bitField: 536870912,
  _fulfillmentHandler0: undefined,
  _rejectionHandler0: 
   Promise {
     _bitField: 0,
     _fulfillmentHandler0: undefined,
     _rejectionHandler0: undefined,
     _progressHandler0: undefined,
     _promise0: undefined,
     _receiver0: undefined,
     _settledValue: undefined },
  _progressHandler0: undefined,
  _promise0: undefined,
  _receiver0: undefined,
  _settledValue: undefined }
> Error caught:  blah
Retrying Demo
Executing Demo
Unhandled rejection Error: blah