It's in fact the "dummy" avatar that is created for testing the animation onto... It's totally harmless (and only visible in the viewer of the uploader).
But I changed the code so that:
- That dummy avatar is no more created when testing animations on your own avatar (it was uselessly created in this case).
- Dummy avatars are no more listed by LLWorld::getAvatars() (they also are in the official viewers, so they'd probably appear in the mini-map and as clouds in them).
- The Radar relies fully on LLWorld::getAvatars() instead of also trying to extract data from LLCharacter (which LLWorld::getAvatars() already does anyway) and catching the dummy avatar in the process...