When you expand a empty folder in the list view, a "empty" tag is showed under the expanded folder. But, if you invoke <properties> in the context menu on the tag, it shows info for a folder (in my case, the user folder), but when logged as root, the "\" (root) folder was shown then.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: nautilus 1:3.2.0-0ubuntu5
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Sun Oct 23 19:10:35 2011
ExecutablePath: /usr/bin/nautilus
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)
Thank you for your bug report, it's a bug at the first place that those "empty" lines are displayed