Comment 3 for bug 518295

It is a bug in the nautilus package hook: Any file which is not packaged (I have a /usr/lib/nautilus/extensions-2.0/libnautilus-brasero-extension.so.orig) causes apport.packaging.get_file_package() to return None, which package_versions() doesn't digest.

However, I'll just make package_versions() get along with this.