From 5155bd150caa4ce8dbd261cd7c24e5115050b5b5 Mon Sep 17 00:00:00 2001
From: Mike Stump <mikestump@comcast.net>
Date: Mon, 1 Jan 2024 19:20:18 -0800
Subject: [PATCH] Allow empty cells into the system.

---
 modules/network/network.lua | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/modules/network/network.lua b/modules/network/network.lua
index 6c92766..0c8ff8c 100644
--- a/modules/network/network.lua
+++ b/modules/network/network.lua
@@ -284,7 +284,9 @@ local function create_inventory(net)
     allow_put = function(inv, listname, index, stack)
       local inside_stack = inv:get_stack(listname, index)
       local stack_name = stack:get_name()
-      if minetest.get_item_group(stack_name, "microexpansion_cell") > 0 then
+      if minetest.get_item_group(stack_name, "microexpansion_cell") > 0 and
+        stack:get_meta():get_string("items") ~= "" and
+        stack:get_meta():get_string("items") ~= "return {}" then
 	return 0
       end
       -- improve performance by skipping unnessecary calls