Load blueprint strings created in Factorio 0.14 and earlier
Mods introducing new content into the game.
Change blueprint behavior.
See https://forums.factorio.com/viewtopic.php?f=97&t=36976&p=242671#p242671
I imported the blueprint two posts before that.
Ok, seems like I misinterpreted this message, new blueprint works.
Seems like I misinterpreted the error message.
It still would be nice if instead of just throwing an error unknown entities/signals where just skipped.
