Merge pull request #4489 from VOREStation/qdel-hints-gen5

Additional Destroy proc fixes

code/game/objects/items/antag_spawners.dm

@@ -12,7 +12,7 @@
 	sparks.attach(loc)
 
 /obj/item/weapon/antag_spawner/Destroy()
-	qdel(sparks)
+	qdel_null(sparks)
 	return ..()
 
 /obj/item/weapon/antag_spawner/proc/spawn_antag(client/C, turf/T)

code/game/objects/items/weapons/implants/implant.dm

@@ -52,6 +52,7 @@
 /obj/item/weapon/implant/Destroy()
 	if(part)
 		part.implants.Remove(src)
+	part = null
 	return ..()
 
 /obj/item/weapon/implant/attackby(obj/item/I, mob/user)

code/game/objects/items/weapons/tanks/tanks.dm

@@ -67,10 +67,10 @@ var/list/global/tank_gauge_cache = list()
 	return
 
 /obj/item/weapon/tank/Destroy()
-	qdel(air_contents)
+	qdel_null(air_contents)
 
 	processing_objects.Remove(src)
-	qdel(src.proxyassembly)
+	qdel_null(src.proxyassembly)
 
 	if(istype(loc, /obj/item/device/transfer_valve))
 		var/obj/item/device/transfer_valve/TTV = loc
@@ -609,6 +609,10 @@ var/list/global/tank_gauge_cache = list()
 /obj/item/device/tankassemblyproxy/receive_signal()	//This is mainly called by the sensor through sense() to the holder, and from the holder to here.
 	tank.ignite()	//boom (or not boom if you made shijwtty mix)
 
+/obj/item/device/tankassemblyproxy/Destroy()
+	. = ..()
+	tank = null
+	assembly = null
 
 /obj/item/weapon/tank/proc/assemble_bomb(W,user)	//Bomb assembly proc. This turns assembly+tank into a bomb
 	var/obj/item/device/assembly_holder/S = W