Return empty arrays while the underlying implementation is incomplete

Just a really minor patch to redirect the call from the underlying binding while the implementation is incomplete.  Basically, I finally got around to writing an rtc.io plugin for the node bindings and because rtc-quickconnect looks for remote streams once connected an error occurs when attempting to talk to the bindings.

More info on the node plugin here:
https://github.com/rtc-io/rtc-plugin-node

I still need to push the changes to rtc-signaller up to npm, but you can clone the plugin repo and play around if you are interested :)