How about a “No Albums….” entry?
Sorry, no can do.
I use the browse feature of rsp to get genres, artists and albums. If any of these tags should be missing in the id3, it is simply not returned on the browse query, because the xml entry doesn’t exist.
A workaround would be to get song info for all of the three above, but that would result in a lot of unnessecary data.
A better workaround is to tag your songs properly! 8)