Pistons fail when device goes missing

[tomdotorg]

I had some z-wave issues with my ST hub last week, and it looks (I do not know how to recover older logs) like any pistons that contained devices that were flakey threw some sort of NPE and failed.

I am just recovering from this with the day off today, so I can not reproduce nor paste in logs.

In the pistons in question, the failing devices' names were replaced with a numeric ID - that's how it lead me to believe this is what is happening.

Sorry I do not have better diagnostics on this.

Seems like the desired behavior would be the piston skipping the devices that do not resolve to anything real, but doing its best to complete the other actions.