NullPointerException from the Lock that has autolock feature
I unlocked my Lock through HomKit UI, my Yale lock has autolock feature to lock it back in 3 minutes. When the lock did autolock itself, the event was not delivered to HomeKit app. The SmartThings app has this in the log:

```
info [DTH] parse() - returning result=null
warn Exception 'java.lang.NullPointerException: Cannot invoke method parse() on null object' encountered parsing 'cmd: 8850, payload: '
trace [DTH] Executing 'parse(String description)' for device Entrance Lock with description = zw device: 06, command: 8850, payload:
```