Failure during registration in remote Napa zone doesn't trigger exception in Hub.register

[daiyip]

Code

const napa = require('napajs');
const winery = require('winery');

const zone = napa.zone.create('z1');
const host = winery.hub();
host.register('<some-bad-app>', ['app-name']);

Expect:

host.register shall throw.

Actual:

host.register doesn't throw, but program ends because of unhandled exception in asynchronous call to napa.zone.broadcast within host.register.