Finaly fixed the statements

The idle condition for mv mashines is changed to what it should be
because sending items into the tube is done in idle, so we only care
if there is something left in src

technic/machines/mv/alloy_furnace.lua

@@ -260,9 +260,9 @@ minetest.register_abm(
 		   end
 		   meta:set_int("tube_time", tube_time)
 
-		   -- The machine shuts down if we have nothing to smelt and no tube is connected
+		   -- The machine shuts down if we have nothing to smelt since we tube stuff
-		   -- or if we have nothing to send with a tube connected.
+		   -- out while being idle.
-		   if inv:is_empty("src") and (not output_tube_connected or inv:is_empty("dst")) then
+		   if inv:is_empty("src") then
 		      next_state = 1
 		   end
 		   ----------------------

technic/machines/mv/electric_furnace.lua

@@ -259,11 +259,11 @@ minetest.register_abm(
 		      end
 		   end
 		   meta:set_int("tube_time", tube_time)
-		   
+
-		   -- The machine shuts down if we have nothing to smelt and no tube is connected
+		-- The machine shuts down if we have nothing to smelt since we tube stuff
-		   -- or if we have nothing to send with a tube connected.
+		-- out while being idle.
-		   if inv:is_empty("src") and (not output_tube_connected or inv:is_empty("dst")) then
+		if inv:is_empty("src") then
-		   next_state = 1
+			next_state = 1
 		end
 		----------------------
 		

technic/machines/mv/grinder.lua

@@ -237,9 +237,9 @@ minetest.register_abm(
 			end
 			meta:set_int("tube_time", tube_time)
 
-			-- The machine shuts down if we have nothing to grind and no tube is connected
+			-- The machine shuts down if we have nothing to smelt since we tube stuff
-			-- or if we have nothing to send with a tube connected.
+			-- out while being idle.
-			if inv:is_empty("src") and (not output_tube_connected or inv:is_empty("dst")) then
+			if inv:is_empty("src") then
 				next_state = 1
 			end