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You should have each country name in your data even if they don't have any data values. If your data includes all countries then make sure that you are not filtering "Null" values out.
If you want to edit tooltip so that it tells that there is no information for the selected country, just format your measure value:
Thanks Ville. I think I can see what 's going on. My problem, I suspect, is that there are no records in my database for the countries that are blanked out on my map. I'll try to add some dummy records for the missing countries and report back if that solves it.