Auto-complete bug in Node configuration

[reelmatt]

When configuring a Node's settings, if a field offers an auto-complete response and an option is selected, the front-end crashes with a TypeError: Cannot read property 'toLowerCase' of undefined.

Screen recording of the bug

[reddigari]

Looks like something in the react-diagrams internals rather than our application. Could be a tough fix. Great catch!

[reddigari]

I think this got resolved by #63 but need a confirmation

[reelmatt]

This is still returning the same error for me in Chrome (not throwing an error in Safari).