Everytime I see a data map on some topic, Western Sahara is always filed under ”No Data” or something similar. I know that the area is disputed by Morocco and some self governing body in the area, but that’s all I know. Is this like an Israel-Palestine thing, or something else?
From what I can gather, that is pretty much the reason.
The Sahrawi Arab Democratic Republic is the self governing body you mentioned but it is only recognised by about 50 nations.
My guess is that, to avoid upsetting Morocco most demographers just give it the “No Data” flag and move on.