[MIRROR] Fixes a bunch of harddels that are sourced from player action (#6252)

* Fixes a bunch of harddels that are sourced from player action

* Mirror!

Co-authored-by: LemonInTheDark <58055496+LemonInTheDark@users.noreply.github.com>
Co-authored-by: Funce <funce.973@gmail.com>

code/game/objects/structures/displaycase.dm

@@ -399,8 +399,6 @@
 	var/sale_price = 20
 	///The Account which will receive payment for purchases. Set by the first ID to swipe the tray.
 	var/datum/bank_account/payments_acc = null
-	///We're using the same trick as paper does in order to cache the image, and only load the UI when messed with.
-	var/list/viewing_ui = list()
 
 /obj/structure/displaycase/forsale/update_icon_state()
 	icon_state = "[initial(icon_state)][broken ? "_broken" : (open ? "_open" : (!showpiece ? "_empty" : null))]"
@@ -416,7 +414,6 @@
 	if(!ui)
 		ui = new(user, src, "Vendatray", name)
 		ui.set_autoupdate(FALSE)
-		viewing_ui[user] = ui
 		ui.open()
 
 /obj/structure/displaycase/forsale/ui_data(mob/user)

code/game/objects/structures/ghost_role_spawners.dm

@@ -77,7 +77,7 @@
 	yolk.equipOutfit(/datum/outfit/ashwalker)//this is an authentic mess we're making
 	yolk.update_body()
 	yolk.gib()
-	qdel(egg)
+	QDEL_NULL(egg)
 	return ..()
 
 
@@ -101,6 +101,11 @@
 	var/datum/team/ashwalkers/team
 	var/obj/structure/ash_walker_eggshell/eggshell
 
+
+/obj/effect/mob_spawn/human/ash_walker/Destroy()
+	eggshell = null
+	return ..()
+
 /obj/effect/mob_spawn/human/ash_walker/allow_spawn(mob/user)
 	if(!(user.key in team.players_spawned))//one per person unless you get a bonus spawn
 		return TRUE
@@ -125,7 +130,7 @@
 		H.remove_language(/datum/language/common)
 	team.players_spawned += (new_spawn.key)
 	eggshell.egg = null
-	qdel(eggshell)
+	QDEL_NULL(eggshell)
 
 /obj/effect/mob_spawn/human/ash_walker/Initialize(mapload, datum/team/ashwalkers/ashteam)
 	. = ..()

code/game/objects/structures/tables_racks.dm

@@ -597,10 +597,21 @@
 	var/mob/living/carbon/M = locate(/mob/living/carbon) in loc
 	if(M)
 		if(M.resting)
-			patient = M
+			set_patient(M)
 	else
-		patient = null
+		set_patient(null)
 
+/obj/structure/table/optable/proc/set_patient(new_patient)
+	if(patient)
+		UnregisterSignal(patient, COMSIG_PARENT_QDELETING)
+	patient = new_patient
+	if(patient)
+		RegisterSignal(patient, COMSIG_PARENT_QDELETING, .proc/patient_deleted)
+
+/obj/structure/table/optable/proc/patient_deleted(datum/source)
+	SIGNAL_HANDLER
+	set_patient(null)
+	
 /obj/structure/table/optable/proc/check_eligible_patient()
 	get_patient()
 	if(!patient)

code/game/objects/structures/traps.dm

@@ -114,6 +114,12 @@
 	time_between_triggers = 10
 	flare_message = "<span class='warning'>[src] snaps shut!</span>"
 
+/obj/structure/trap/stun/hunter/Destroy()
+	if(!QDELETED(stored_item))
+		qdel(stored_item)
+	stored_item = null
+	return ..()
+
 /obj/structure/trap/stun/hunter/on_entered(datum/source, atom/movable/AM)
 	if(isliving(AM))
 		var/mob/living/L = AM
@@ -167,7 +173,9 @@
 	forceMove(stored_trap)//moves item into trap
 
 /obj/item/bountytrap/Destroy()
-	qdel(stored_trap)
+	if(!QDELETED(stored_trap))
+		qdel(stored_trap)
+	stored_trap = null
 	QDEL_NULL(radio)
 	QDEL_NULL(spark_system)
 	. = ..()