fixed check for Mesecons.

nodeboxes.lua

@@ -461,53 +461,6 @@ minetest.register_node("scifi_nodes:lightbar", {
 	sounds = default.node_sound_glass_defaults()
 })
 
---wall switch, currently does not do anything
-minetest.register_node("scifi_nodes:switch_off", {
-	description = "Wall switch",
-	tiles = {
-		"scifi_nodes_switch_off.png",
-	},
-	inventory_image = "scifi_nodes_switch_on.png",
-	wield_image = "scifi_nodes_switch_on.png",
-	drawtype = "signlike",
-	sunlight_propagates = true,
-	selection_box = {
-		type = "wallmounted",
-		fixed = {-0.5, -0.3, -0.3, -0.45, 0.3, 0.3}
-	},
-	paramtype = "light",
-	paramtype2 = "wallmounted",
-	groups = {cracky=1, oddly_breakable_by_hand=1},
-	on_rightclick = function(pos, node, clicker, item, _)
-			minetest.set_node(pos, {name="scifi_nodes:switch_on", param2=node.param2})
-	end,
-	sounds = default.node_sound_glass_defaults()
-})
-
-minetest.register_node("scifi_nodes:switch_on", {
-	description = "Wall switch",
-	sunlight_propagates = true,
-	tiles = {
-		"scifi_nodes_switch_on.png",
-	},
-	inventory_image = "scifi_nodes_switch_on.png",
-	wield_image = "scifi_nodes_switch_on.png",
-	drawtype = "signlike",
-	selection_box = {
-		type = "wallmounted",
-		fixed = {-0.5, -0.3, -0.3, -0.45, 0.3, 0.3}
-	},
-	paramtype = "light",
-	paramtype2 = "wallmounted",
-	light_source = 5,
-	groups = {cracky=1, oddly_breakable_by_hand=1, not_in_creative_inventory=1},
-	on_rightclick = function(pos, node, clicker, item, _)
-			minetest.set_node(pos, {name="scifi_nodes:switch_off", param2=node.param2})
-	end,
-	sounds = default.node_sound_glass_defaults()
-})
---end of wall switch
-
 minetest.register_node("scifi_nodes:light_dynamic", {
 	description = "Wall light",
 	tiles = {
@@ -1244,7 +1197,8 @@ minetest.register_node("scifi_nodes:windowpanel", {
     sounds = default.node_sound_glass_defaults(),
 })
 
-if  (mesecon.receptor_on ~= nil) and
+if  (mesecon ~= nil) and
+    (mesecon.receptor_on ~= nil) and
     (mesecon.receptor_off ~= nil)           then
    minetest.register_node("scifi_nodes:switch_off", {
         description = "Wall switch",
@@ -1302,4 +1256,53 @@ if  (mesecon.receptor_on ~= nil) and
         }
     })
     
-end
+else
+    --wall switch, currently does not do anything
+    minetest.register_node("scifi_nodes:switch_off", {
+        description = "Wall switch",
+        tiles = {
+            "scifi_nodes_switch_off.png",
+        },
+        inventory_image = "scifi_nodes_switch_on.png",
+        wield_image = "scifi_nodes_switch_on.png",
+        drawtype = "signlike",
+        sunlight_propagates = true,
+        selection_box = {
+            type = "wallmounted",
+            fixed = {-0.5, -0.3, -0.3, -0.45, 0.3, 0.3}
+        },
+        paramtype = "light",
+        paramtype2 = "wallmounted",
+        groups = {cracky=1, oddly_breakable_by_hand=1},
+        on_rightclick = function(pos, node, clicker, item, _)
+                minetest.set_node(pos, {name="scifi_nodes:switch_on", param2=node.param2})
+        end,
+        sounds = default.node_sound_glass_defaults()
+    })
+
+    minetest.register_node("scifi_nodes:switch_on", {
+        description = "Wall switch",
+        sunlight_propagates = true,
+        tiles = {
+            "scifi_nodes_switch_on.png",
+        },
+        inventory_image = "scifi_nodes_switch_on.png",
+        wield_image = "scifi_nodes_switch_on.png",
+        drawtype = "signlike",
+        selection_box = {
+            type = "wallmounted",
+            fixed = {-0.5, -0.3, -0.3, -0.45, 0.3, 0.3}
+        },
+        paramtype = "light",
+        paramtype2 = "wallmounted",
+        light_source = 5,
+        groups = {cracky=1, oddly_breakable_by_hand=1, not_in_creative_inventory=1},
+        on_rightclick = function(pos, node, clicker, item, _)
+                minetest.set_node(pos, {name="scifi_nodes:switch_off", param2=node.param2})
+        end,
+        sounds = default.node_sound_glass_defaults()
+    })
+    
+    --end of wall switch
+    
+end -- if(mesecon.receptor ~= on