Change error handling in fallback

[shankars99]

Chapter 15 (How to Build an Oracle - Part 2) contains the following code in the default workspace

the code within:

oracleContract.events.SetLatestEthPriceEvent(async (err, event) => {

has:

if (err) { 
      console.error('Error on event', err) 
      return 
    }
    // Do something
  })

however it expects:

if (err) console.error('Error on event', err)

changing the evaluator to accept either the first or change the default workspace to include the newer one would help solve the issue

[tholu]

This is a problem in a lot of Lesson 15 chapters and rather frustrating.