## About The Pull Request
The on_finish_callbacks list in `/datum/move_loop/has_target/jps` was
not initialized. Usually, when you add something to an uninitialized
list, it gets initialized and the item gets added to it. However, the
`CALLBACK` wrapper is around `new /datum/callback`, this fails.
This meant on_finish_callback was not a list, therefore at the end of
pathfinding, its contents could not be iterated and invoked. This PR
fixes this problem by initializing the list.
## Why It's Good For The Game
Closes#79383
Blob minions rally and punch again.
## Changelog
🆑
fix: Basic mobs using JPS can move again
/🆑
1e8507e154