Converts Most Destroys to use QDEL_NULL

code/game/objects/structures/artstuff.dm

@@ -20,9 +20,7 @@
 	var/obj/item/weapon/canvas/painting = null
 
 /obj/structure/easel/Destroy()
-	if(painting)
-		qdel(painting)
-		painting = null
+	QDEL_NULL(painting)
 	return ..()
 
 //Adding canvases

code/game/objects/structures/displaycase.dm

@@ -23,12 +23,8 @@ var/global/list/captain_display_cases = list()
 	var/state = DISPLAYCASE_FRAME_CIRCUIT
 
 /obj/structure/displaycase_frame/Destroy()
-	if(circuit)
-		qdel(circuit)
-		circuit = null
-	if(sensor)
-		qdel(sensor)
-		sensor = null
+	QDEL_NULL(circuit)
+	QDEL_NULL(sensor)
 	return ..()
 
 /obj/structure/displaycase_frame/attackby(obj/item/weapon/W as obj, mob/user as mob, params)
@@ -125,8 +121,7 @@ var/global/list/captain_display_cases = list()
 
 /obj/structure/displaycase/Destroy()
 	dump()
-	qdel(circuit)
-	circuit = null
+	QDEL_NULL(circuit)
 	return ..()
 
 /obj/structure/displaycase/captains_laser/Destroy()

code/game/objects/structures/door_assembly.dm

@@ -18,9 +18,7 @@
 	update_state()
 
 /obj/structure/door_assembly/Destroy()
-	if(electronics)
-		qdel(electronics)
-		electronics = null
+	QDEL_NULL(electronics)
 	return ..()
 
 /obj/structure/door_assembly/door_assembly_com

code/game/objects/structures/engicart.dm

@@ -15,30 +15,14 @@
 	var/obj/item/taperoll/engineering/myengitape = null
 
 /obj/structure/engineeringcart/Destroy()
-	if(myglass)
-		qdel(myglass)
-		myglass = null
-	if(mymetal)
-		qdel(mymetal)
-		mymetal = null
-	if(myplasteel)
-		qdel(myplasteel)
-		myplasteel = null
-	if(myflashlight)
-		qdel(myflashlight)
-		myflashlight = null
-	if(mybluetoolbox)
-		qdel(mybluetoolbox)
-		mybluetoolbox = null
-	if(myyellowtoolbox)
-		qdel(myyellowtoolbox)
-		myyellowtoolbox = null
-	if(myredtoolbox)
-		qdel(myredtoolbox)
-		myredtoolbox = null
-	if(myengitape)
-		qdel(myengitape)
-		myengitape = null
+	QDEL_NULL(myglass)
+	QDEL_NULL(mymetal)
+	QDEL_NULL(myplasteel)
+	QDEL_NULL(myflashlight)
+	QDEL_NULL(mybluetoolbox)
+	QDEL_NULL(myyellowtoolbox)
+	QDEL_NULL(myredtoolbox)
+	QDEL_NULL(myengitape)
 	return ..()
 
 /obj/structure/engineeringcart/proc/put_in_cart(obj/item/I, mob/user)

code/game/objects/structures/extinguisher.dm

@@ -9,9 +9,7 @@
 	var/opened = 0
 
 /obj/structure/extinguisher_cabinet/Destroy()
-	if(has_extinguisher)
-		qdel(has_extinguisher)
-		has_extinguisher = null
+	QDEL_NULL(has_extinguisher)
 	return ..()
 
 /obj/structure/extinguisher_cabinet/attackby(obj/item/O, mob/user, params)

code/game/objects/structures/janicart.dm

@@ -25,18 +25,10 @@
 
 /obj/structure/janitorialcart/Destroy()
 	janitorial_equipment -= src
-	if(mybag)
-		qdel(mybag)
-		mybag = null
-	if(mymop)
-		qdel(mymop)
-		mymop = null
-	if(myspray)
-		qdel(myspray)
-		myspray = null
-	if(myreplacer)
-		qdel(myreplacer)
-		myreplacer = null
+	QDEL_NULL(mybag)
+	QDEL_NULL(mymop)
+	QDEL_NULL(myspray)
+	QDEL_NULL(myreplacer)
 	return ..()
 
 /obj/structure/janitorialcart/proc/wet_mop(obj/item/weapon/mop, mob/user)

code/game/objects/structures/morgue.dm

@@ -160,9 +160,7 @@
 	return
 
 /obj/structure/morgue/Destroy()
-	if(connected)
-		qdel(connected)
-		connected = null
+	QDEL_NULL(connected)
 	return ..()
 
 /obj/structure/morgue/container_resist(var/mob/living/L)
@@ -405,9 +403,7 @@
 	return
 
 /obj/structure/crematorium/Destroy()
-	if(connected)
-		qdel(connected)
-		connected = null
+	QDEL_NULL(connected)
 	return ..()
 
 /obj/structure/crematorium/container_resist(var/mob/living/L)
@@ -471,7 +467,7 @@
 		connected.connected = null
 	connected = null
 	return ..()
-	
+
 // Crematorium switch
 /obj/machinery/crema_switch
 	desc = "Burn baby burn!"
@@ -484,7 +480,7 @@
 	var/area/area = null
 	var/otherarea = null
 	var/id = 1
-	
+
 /obj/machinery/crema_switch/attack_ghost(mob/user)
 	if(user.can_advanced_admin_interact())
 		return attack_hand(user)

code/game/objects/structures/musician.dm

@@ -281,8 +281,7 @@
 		icon_state = "piano"
 
 /obj/structure/piano/Destroy()
-	qdel(song)
-	song = null
+	QDEL_NULL(song)
 	return ..()
 
 /obj/structure/piano/initialize()

code/game/objects/structures/target_stake.dm

@@ -9,9 +9,7 @@
 	var/obj/item/target/pinned_target // the current pinned target
 
 /obj/structure/target_stake/Destroy()
-	if(pinned_target)
-		qdel(pinned_target)
-		pinned_target = null
+	QDEL_NULL(pinned_target)
 	return ..()
 
 /obj/structure/target_stake/Move()

code/game/objects/structures/windoor_assembly.dm

@@ -34,9 +34,7 @@ obj/structure/windoor_assembly/New(dir=NORTH)
 
 obj/structure/windoor_assembly/Destroy()
 	density = 0
-	if(electronics)
-		qdel(electronics)
-		electronics = null
+	QDEL_NULL(electronics)
 	air_update_turf(1)
 	return ..()