Warsetup (version 184.108.40.206) inserts empty components in directories that contain no ordinary files, only other directories. These are not just unnecessary, they eventually lead to WIX validation errors like this:
error LGHT0204 : ICE18: KeyPath for Component: 'ID3810' is Directory: 'ID1062'. The Directory/Component pair must be listed in the CreateFolders table. The component mentioned here is one of those empty ones; the directory is the one in which it is incorrectly inserted.