Help:Buildings data consistency

These list display items where some value is missing, altought it should be there. Theses lists then should be empty:

• Theatres without cities

https://tinyurl.com/23sdslr2

• Theatres without countries

https://tinyurl.com/2b3db7ol

• Non existent theatres that don't have date of closure

https://tinyurl.com/yo3eqldm

• Building not used as theatre today that don't have date of closure

https://tinyurl.com/yomlpd5d