Cyborg inventory runtime fix. (tgstation#53741)

Following the cyborg inventory refactor, code changed a bit.

Cyborg inventory screens are inited in the HUD, however AI Shells don't generate a HUD until an AI assumes direct control.

Damaging an AI shell before the AI created a HUD in it would cause runtimes as modules disabled and enabled.

To remedy this, we now initialize the core inventory slots on the robit Init() and then update them as necessary in the HUD code later on if an AI ever deigns to grace your shell with their exalted presence instead of asking for it and then never using it.

code/_onclick/hud/robot.dm

@@ -93,7 +93,8 @@
 
 /datum/hud/robot/New(mob/owner)
 	..()
-	var/mob/living/silicon/robot/mymobR = mymob
+	// i, Robit
+	var/mob/living/silicon/robot/robit = mymob
 	var/obj/screen/using
 
 	using = new/obj/screen/language_menu
@@ -107,23 +108,26 @@
 	static_inventory += using
 
 //Module select
-	using = new /obj/screen/robot/module1()
-	using.screen_loc = ui_inv1
-	using.hud = src
-	static_inventory += using
-	mymobR.inv1 = using
+	if(!robit.inv1)
+		robit.inv1 = new /obj/screen/robot/module1()
 
-	using = new /obj/screen/robot/module2()
-	using.screen_loc = ui_inv2
-	using.hud = src
-	static_inventory += using
-	mymobR.inv2 = using
+	robit.inv1.screen_loc = ui_inv1
+	robit.inv1.hud = src
+	static_inventory += robit.inv1
 
-	using = new /obj/screen/robot/module3()
-	using.screen_loc = ui_inv3
-	using.hud = src
-	static_inventory += using
-	mymobR.inv3 = using
+	if(!robit.inv2)
+		robit.inv2 = new /obj/screen/robot/module2()
+
+	robit.inv2.screen_loc = ui_inv2
+	robit.inv2.hud = src
+	static_inventory += robit.inv2
+
+	if(!robit.inv3)
+		robit.inv3 = new /obj/screen/robot/module3()
+
+	robit.inv3.screen_loc = ui_inv3
+	robit.inv3.hud = src
+	static_inventory += robit.inv3
 
 //End of module select
 
@@ -149,14 +153,14 @@
 	using.screen_loc = ui_borg_lamp
 	using.hud = src
 	static_inventory += using
-	mymobR.lamp_button = using
+	robit.lamp_button = using
 
 //Thrusters
 	using = new /obj/screen/robot/thrusters()
 	using.screen_loc = ui_borg_thrusters
 	using.hud = src
 	static_inventory += using
-	mymobR.thruster_button = using
+	robit.thruster_button = using
 
 //Intent
 	action_intent = new /obj/screen/act_intent/robot()
@@ -170,10 +174,10 @@
 	infodisplay += healths
 
 //Installed Module
-	mymobR.hands = new /obj/screen/robot/module()
-	mymobR.hands.screen_loc = ui_borg_module
-	mymobR.hands.hud = src
-	static_inventory += mymobR.hands
+	robit.hands = new /obj/screen/robot/module()
+	robit.hands.screen_loc = ui_borg_module
+	robit.hands.hud = src
+	static_inventory += robit.hands
 
 //Store
 	module_store_icon = new /obj/screen/robot/store()

code/modules/mob/living/silicon/robot/robot.dm

@@ -114,6 +114,10 @@
 	robot_modules_background.layer = HUD_LAYER	//Objects that appear on screen are on layer ABOVE_HUD_LAYER, UI should be just below it.
 	robot_modules_background.plane = HUD_PLANE
 
+	inv1 = new /obj/screen/robot/module1()
+	inv2 = new /obj/screen/robot/module2()
+	inv3 = new /obj/screen/robot/module3()
+
 	ident = rand(1, 999)
 
 	previous_health = health
@@ -188,12 +192,12 @@
 		if(T && istype(radio) && istype(radio.keyslot))
 			radio.keyslot.forceMove(T)
 			radio.keyslot = null
-	qdel(wires)
-	qdel(module)
-	qdel(eye_lights)
-	wires = null
-	module = null
-	eye_lights = null
+	QDEL_NULL(wires)
+	QDEL_NULL(module)
+	QDEL_NULL(eye_lights)
+	QDEL_NULL(inv1)
+	QDEL_NULL(inv2)
+	QDEL_NULL(inv3)
 	cell = null
 	return ..()