nodejs segfaults on zwave.disconnect()

[bbf]

Hello,

I'm creating a Node-Red node for node-openzwave, and I have some listeners that run when the flows are starting and stopping. But the thing is that Node-Red sends a stop before sending the start event, and so I end up calling zwave.disconnect() before ever calling the connect. And that is causing zwave to segfault nodejs. For now I'll just use boolean to avoid that, but I don't think that node-openzwave should crash like that.