monitor's error handler throws errors

[Bluebie]

On node v7.5.0 with miio v0.4.0:

(node:937) TypeError: Cannot read property 'stack' of undefined
    at getProperties.then.catch.err (node_modules/miio/device.js:193:44)
(node:937) DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
    at emitWarning (internal/process/promises.js:69:15)
    at emitPendingUnhandledRejections (internal/process/promises.js:86:11)
    at runMicrotasksCallback (internal/process/next_tick.js:61:9)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)
(node:937) TypeError: Cannot read property 'stack' of undefined
    at getProperties.then.catch.err (node_modules/miio/device.js:193:44)

This code has been moved in the current head but still exists at https://github.com/aholstenson/miio/blob/master/device.js#L240

[aholstenson]

Could you see if you have the same issue in 0.5.0? The error handling should be a bit more resilient now.

[aholstenson]

Closing this as I think it has been solved for a while now.