Crash with filter eject

[dacmot]

Ubuntu 22.04, Minetest 5.9.0, WhyNot game, hopper at 0baf36e

I removed the secondary exit pipe on the filter (see picture in #30) and now it crashes when I set the filter to eject.

AsyncErr: Lua: Runtime error from mod 'hopper' in callback node_on_timer(): ...minetest/games/whynot-game/mods/tools/hopper/utility.lua:155: attempt to index local 'target_inv_info' (a nil value)
stack traceback:
	...minetest/games/whynot-game/mods/tools/hopper/utility.lua:155: in function 'try_send_item'
	...est/games/whynot-game/mods/tools/hopper/nodes/sorter.lua:192: in function <...est/games/whynot-game/mods/tools/hopper/nodes/sorter.lua:150>

I bisected the main branch and found the regression happened in the following commit:

df5f8d837932dc70a812b850ef9b78ee3733111d is the first bad commit
commit df5f8d837932dc70a812b850ef9b78ee3733111d
Author: Ajrat Makhmutov <[email protected]>
Date:   Sun Jul 21 04:16:35 2024 +0300

    Add multi-node containers support
    
    + remove trailing spaces
    + add new api for extra information about containers

 abms.lua          |  12 ++---
 api.lua           | 130 ++++++++++++++++++++++++++++++++++++++----------------
 nodes/chute.lua   |  12 ++---
 nodes/hoppers.lua |  28 +++++++-----
 nodes/sorter.lua  |  42 +++++++++---------
 utility.lua       |  64 ++++++++++++++++++---------
 6 files changed, 184 insertions(+), 104 deletions(-)