"An error occurred in the code review bot": object of type 'NoneType' has no len()

[imnotlxy]

The link is https://phabricator.services.mozilla.com/B859544. There is no clue about what is wrong with my code :-(

[La0]

Unfortunately, I do not repro the bot issue locally. I was able to trigger a try push with your changes https://treeherder.mozilla.org/jobs?repo=try&revision=6b7b2cfb29c1aa34f52958a7fa54616424af13e2