Makes DNA locking chips not work if you have no DNA (#18905)

* Makes DNA locking chips not work if you have no DNA

* Makes artifact gun casings delete on use

code/modules/projectiles/dnalocking.dm

@@ -13,6 +13,7 @@
 	var/exploding = 0
 
 /obj/item/dnalockingchip/Destroy(force, ...)
+	stored_dna.Cut()
 	. = ..()
 
 /obj/item/gun/proc/get_dna(mob/user)
@@ -21,17 +22,22 @@
 
 		if(attached_lock.stored_dna && (M.dna.unique_enzymes in attached_lock.stored_dna))
 			to_chat(M, span_warning("\The [src] buzzes and displays a symbol showing the gun already contains your DNA."))
-			return 0
+			return FALSE
+		else if(ishuman(M))
+			var/mob/living/carbon/human/human = user
+			if(human.species.flags & NO_DNA)
+				to_chat(human, span_warning("\The [src] buzzes and displays an NO DNA DETECTED symbol."))
+				return FALSE
 		else
 			attached_lock.stored_dna += M.dna.unique_enzymes
 			to_chat(M, span_notice("\The [src] pings and a needle flicks out from the grip, taking a DNA sample from you."))
 			if(!attached_lock.controller_dna)
 				attached_lock.controller_dna = M.dna.unique_enzymes
 				to_chat(M, span_notice("\The [src] processes the dna sample and pings, acknowledging you as the primary controller."))
-			return 1
+			return TRUE
 	else
 		to_chat(M, span_warning("\The [src] buzzes and displays a locked symbol. It is not allowing DNA samples at this time."))
-		return 0
+		return FALSE
 
 /obj/item/gun/verb/give_dna()
 	set name = "Give DNA"
@@ -44,18 +50,18 @@
 	if(!attached_lock.controller_lock)
 		if(!authorized_user(M))
 			to_chat(M, span_warning("\The [src] buzzes and displays an invalid user symbol."))
-			return 0
+			return FALSE
 		else
 			attached_lock.stored_dna -= user.dna.unique_enzymes
 			to_chat(M, span_notice("\The [src] beeps and clears the DNA it has stored."))
 			if(M.dna.unique_enzymes == attached_lock.controller_dna)
 				to_chat(M, span_notice("\The [src] beeps and removes you as the primary controller."))
 				if(attached_lock.controller_lock)
-					attached_lock.controller_lock = 0
-			return 1
+					attached_lock.controller_lock = FALSE
+			return TRUE
 	else
 		to_chat(M, span_warning("\The [src] buzzes and displays a locked symbol. It is not allowing DNA modifcation at this time."))
-		return 0
+		return FALSE
 
 /obj/item/gun/verb/remove_dna()
 	set name = "Remove DNA"
@@ -67,10 +73,10 @@
 	var/mob/living/M = user
 	if(authorized_user(M) && user.dna.unique_enzymes == attached_lock.controller_dna)
 		if(!attached_lock.controller_lock)
-			attached_lock.controller_lock = 1
+			attached_lock.controller_lock = TRUE
 			to_chat(M, span_notice("\The [src] beeps and displays a locked symbol, informing you it will no longer allow DNA samples."))
 		else
-			attached_lock.controller_lock = 0
+			attached_lock.controller_lock = FALSE
 			to_chat(M, span_notice("\The [src] beeps and displays an unlocked symbol, informing you it will now allow DNA samples."))
 	else
 		to_chat(M, span_warning("\The [src] buzzes and displays an invalid user symbol."))
@@ -83,7 +89,7 @@
 
 /obj/item/gun/proc/authorized_user(mob/user)
 	if(!attached_lock.stored_dna || !attached_lock.stored_dna.len)
-		return 1
+		return TRUE
 	if(!(user.dna.unique_enzymes in attached_lock.stored_dna))
-		return 0
-	return 1
+		return FALSE
+	return TRUE

code/modules/xenoarcheaology/finds/Weapons/archeo_guns.dm

@@ -34,6 +34,7 @@
 	drop_sound = 'sound/items/drop/ring.ogg'
 	pickup_sound = 'sound/items/pickup/ring.ogg'
 	projectile_type = /obj/item/projectile/bullet/cap //Just a placeholder. Doesn't actually matter what this is. All that matters is what the projecttile_type of our BB is.
+	caseless = TRUE
 
 /obj/item/ammo_casing/artifact/Initialize(mapload) //These should ONLY ever be in artifact weapons. If you spawn outside of artifact weapons, it'll have a riot foam dart inside of it as the bullet.
 	. = ..()