Node: Exceptions in async callbacks silently break the function

[brettsam]

This http trigger has a nullref:

module.exports = function(context, req) {
    setTimeout(function() {
        var name = req.body.does.not.exist;    
        context.done();
    }, 1);
};

But when you run it, the function never completes, you get no indication of an error, you get no log of it in the dashboard, etc.

Doing the same thing in the main body of the method does what you'd expect: Exception while executing function: Functions.HttpTriggerNodeJS1. mscorlib: TypeError: Cannot read property 'not' of undefined