more refactor

code/datums/elements/mob_holder.dm

@@ -153,7 +153,8 @@
 		L.forceMove(get_turf(L))
 		L.reset_perspective()
 		L.setDir(SOUTH)
-	qdel(src)
+	if(!QDELETED(src))
+		qdel(src)
 
 /obj/item/clothing/head/mob_holder/relaymove(mob/user)
 	return

code/modules/mob/living/silicon/pai/pai_shell.dm

@@ -86,12 +86,10 @@
 	if(resting)
 		icon_state = "[chassis]_rest"
 	to_chat(src, "<span class='boldnotice'>You switch your holochassis projection composite to [chassis]</span>")
+	current_mob_holder?.Detach(src)
+	current_mob_holder = null
 	if(possible_chassis[chassis])
 		current_mob_holder = AddElement(/datum/element/mob_holder, chassis, 'icons/mob/pai_item_head.dmi', 'icons/mob/pai_item_rh.dmi', 'icons/mob/pai_item_lh.dmi', SLOT_HEAD)
-	else
-		current_mob_holder?.Detach(src)
-		current_mob_holder = null
-		return
 
 /mob/living/silicon/pai/lay_down()
 	..()