java.lang.NullPointerException on Color Coordinator

[diablodale]

java.lang.NullPointerException: Cannot get property 'id' on null object @ line 36

Repro:
Never have installed or run Color coordinator.
Choose it from the mobile app for smart apps.

Result:
red error at the top of the mobile app: You are not authorized to perform the requested operation
using the graph.smartthings website and live logging, you can see the actual error is:
java.lang.NullPointerException: Cannot get property 'id' on null object @ line 36

Expected:
No error and to see the config UI for Color Coordinator.

This appears to be related to the recent commit
3835dcc#diff-d876d2aa4e1acf5dfb8f5f07f2e7c120R36

The line is:
def masterInList = slaves.id.find{it==master.id}

If this is the very first time the smartapp is installed/run, then there is no slaves object. The object is null/undefined. Therefore, it is not possible to get the id property on it. And therefore, the java exception occurs.

[coreyarb]

Michael, can you lend any help/suggestions for that color coordinator? Thank you!

https://community.smartthings.com/t/cant-choose-color-coordinator-smartapp-in-ide/41311