Del The World: Unit testing for hard deletes (#59612)

Co-authored-by: SteelSlayer <42044220+SteelSlayer@users.noreply.github.com>

code/modules/surgery/organs/external/_external_organs.dm

@@ -34,12 +34,9 @@
 */
 /obj/item/organ/external/Initialize(mapload, mob_sprite)
 	. = ..()
-
 	if(mob_sprite)
 		set_sprite(mob_sprite)
 
-	cache_key = generate_icon_cache()
-
 /obj/item/organ/external/Insert(mob/living/carbon/reciever, special, drop_if_replaced)
 	var/obj/item/bodypart/limb = reciever.get_bodypart(zone)
 
@@ -75,7 +72,7 @@
 /obj/item/organ/external/proc/get_overlays(list/overlay_list, image_dir, image_layer, body_type, image_color)
 	if(!sprite_datum)
 		return
-	if(HAS_TRAIT(owner, TRAIT_INVISIBLE_MAN))
+	if(owner && HAS_TRAIT(owner, TRAIT_INVISIBLE_MAN))
 		return
 	var/gender = (body_type == FEMALE) ? "f" : "m"
 	var/finished_icon_state = (sprite_datum.gender_specific ? gender : "m") + "_" + preference + "_" + sprite_datum.icon_state + mutant_bodyparts_layertext(image_layer)

code/modules/surgery/organs/heart.dm

@@ -438,6 +438,9 @@
 
 /obj/structure/ethereal_crystal/Initialize(mapload, obj/item/organ/heart/ethereal/ethereal_heart)
 	. = ..()
+	if(!ethereal_heart)
+		stack_trace("Our crystal has no related heart")
+		return INITIALIZE_HINT_QDEL
 	src.ethereal_heart = ethereal_heart
 	ethereal_heart.owner.visible_message(span_notice("The crystals fully encase [ethereal_heart.owner]!"))
 	to_chat(ethereal_heart.owner, span_notice("You are encased in a huge crystal!"))