Dynamic filter

I have stock market data for 10 countries and i have another dataset with many countries showing population and all. 

i have put a slicer on the population dataset, and there are many countries in that 

When I select a country in the slicer which is not present in the stock market dataset, I want all the stock market data to be shown and when a country is selected which is there in the stock market dataset, it should filter the stock market dataset. 

Currently when i select a country which is not present in the stock market dataset, the visualisation is blank (I want all the data to be shown when this happens).

thank you