On my Google+ Android app (version 18.104.22.168805) there is a Circle with no name. There's no one in the Circle.
When I check Google+ on the web, this mystery Circle is not there. All of my Circles are as they should be.
I've already Force Stopped and cleared the data for the app.
What's going on or, at least, how do I get rid of it?
A new version of the app came out today (22.214.171.124662) with "numerous bug fixes" mentioned in the "What's New" text.
This apparently is one of the fixes. Everything is back to normal now.
This is not the resolution you are looking for, but I'd like to share that I have same problem with you.
The blank circle appeared a few days ago. There's no blank circle when I check Google+ web page, but there's a mysterious circle with no name (blank name) when I use Google+ android app.
I tried to uninstall and reinstall Google+ app, but it didn't resolve the problem.
Only a few people have reported this problem, and there's a post related to this on Google group too.
I hope it can be fixed soon.