Subscriber optional context

[cdomigan]

Thanks for this library.

I'm wanting to use Subscriber, but in a place where the context (broadcast) is not always set. In this case I would like to use either a default prop, or simply undefined.

Currently I can't do this, and I get this error:
browser.js:40 Uncaught Error: <Subscriber channel="filterStore"> must be rendered in the context of a <Broadcast channel="filterStore">

[mjackson]

You can do this right now. In 57de4ff we made context.broadcasts optional, so you're probably just using an older version of the library.