Code review comment for lp:~sseman/juju-ci-tools/model-change-watcher-py3

I wasn't sure who updated the code, so I removed the change and ran the tests. Since the code is in fakejuju, any issue should be discovered by just running the tests. The test didn't fail but I didn't notice the warning. This code has been reverted.

Incremental diff https://pastebin.canonical.com/173183/