What is the problem?
There are circumstances under which a contributor's username is hidden.
Currently, the revision details popup shows nothing for the username and the User_talk and Special:Contributions links are invalid. See screenshot.
I don't think we are likely to see this problem often. It would require a contributor's username to be hidden but not have their revision reverted. Unless a user explicitly goes to the old revision (like the example in the reproduction steps).
- If there is a hidden contributor, display the following: "(Username or IP removed)"
- No talk page or contribs link needed
Steps to reproduce problem
- Turn on WWT
- Click any word in the second sentence