Interest Groups not showing in handler config form

Yeah that looks pretty fine when i test drove the module for evaluation i applied the same quickfix.

Promoting as group selection is currently completely broken.

Here's an update in case anyone's struggling with this:
Your groups have to be set to be visible on the Mailchimp signup forms setup, or the Webform handler won't see them. You can't change groups from hidden to visible in the Mailchimp admin interface as far as I can tell, so you may have to delete and re-create your group.
Once I did that, (and with the patch applied), I was able to see and select my groups.
I'd prefer to be able to hide the group selection in my user-driven signup forms, but that's a Mailchimp issue.

IMHO it's pretty clear that also invisible groups should be provided in the UI. Maybe indicate invisibility.
The whole idea of invisible groups is to assign them implicitly based on specific conditions.

Oops, as there is no response from the Testbot, it seems there are no tests at all for Webform Mailchimp?
https://www.drupal.org/node/1001256/qa

That's a bit unfortunate.. :-) We should figure out how to do back quality assurance.

OK, this makes the visible groups work as @Sam stated.

Let's discuss about making hidden group available for selection in #2906484: Subscribing webform submitters to a hidden Mailchimp interest group?

Works very well, meanwhile tested multiple times.

Committed. Thank you.