Revert (1/3) "Revert fixes to crash world border"

This reverts commit 18f73ba31f.

mods/ITEMS/REDSTONE/mesecons/internal.lua

@@ -484,6 +484,7 @@ function mesecon.turnoff(pos, link)
 				local np = vector.add(f.pos, r)
 				local n = mesecon.get_node_force(np)
 
+				if not (mesecon.get_node_force(np) == nil) then
 					if mesecon.is_receptor_on(n.name) then
 						local receptorrules = mesecon.receptor_get_rules(n)
 						for _, rr in pairs(receptorrules) do
@@ -492,6 +493,7 @@ function mesecon.turnoff(pos, link)
 							end
 						end
 					end
+				end
 				for _, l in ipairs(mesecon.rules_link_rule_all(f.pos, r)) do
 					local nlink = table.copy(l)
 					nlink.spread = false