Error message tweaking

While I was using your site to learn about Handlebars, I got an error, which was printed to the screen.  Then I fixed my code, hit the “Compile” button again, but nothing happened.  It took me a bit to see that the error message only gets written to when an error is thrown.  There is no feedback confirming the code is fixed and that’s a bit confusing.  This request has some changes to make this a little more verbose.  Thanks for considering.