How to detect if no player are on a team?

How to detect if no player are on a team? - From below of crop multiethnic team of professional basketball players gathering and putting hands together while standing on playground before game

I have 4 teams red,Blue,Yellow, and Green. I want to automatically detect if there are no players on each of these teams.

What I currently have set up is after three deaths you are removed from your team. when all team members are gone, what command(s) can I use to automatically detect that?

FYI- I'm playing on the latest 1.9 snapshot!






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