default for unavailable fao statistics
See comments / adaptions made here to the documentation: https://www.notion.so/eaternity/Origin-GFM-9fd0165fd7854edaa804b9cf1b8957db.
In addition to the unit tests, the implementation was tested on Pane Caprese, where there are no more "default-14_000km sea distances" after the changes.
Edited by Yannick Schubert