Sell last "entity": Allow sales of "last country" or "last enterprise" (Fearless Blue)

This is a suggestion to allow the sale of the "last entity" on a world. This would allow the sale of the "last country" or the "last enterprise".

Examples of current error messages:

reference: https://www.simcountry.com/cgi-bin/cgip?plogplay (portal > Cash Market > Offer a Country or Enterprise For Sale > offer country/enterprise for sale)

"Sorry, you can't sell your last enterprise on Kebir Blue."

"Sorry, you can't sell your last country on White Giant."

Thank you for considering this suggestion.

Agreed.

Ditto