Fixes musician quirk runtime without backpack. (#44703)

* Fixes musician quirk runtime without backpack.

* copypasta mistakes.

code/datums/traits/good.dm

@@ -98,9 +98,11 @@
 /datum/quirk/musician/on_spawn()
 	var/mob/living/carbon/human/H = quirk_holder
 	var/obj/item/choice_beacon/music/B = new(get_turf(H))
-	H.put_in_hands(B)
-	H.equip_to_slot(B, SLOT_IN_BACKPACK)
-	H.regenerate_icons()
+	var/list/slots = list (
+		"backpack" = SLOT_IN_BACKPACK,
+		"hands" = SLOT_HANDS,
+	)
+	H.equip_in_one_of_slots(B, slots , qdel_on_fail = TRUE)
 
 /datum/quirk/night_vision
 	name = "Night Vision"

code/modules/mob/living/carbon/inventory.dm

@@ -72,7 +72,7 @@
 			put_in_hands(I)
 			update_inv_hands()
 		if(SLOT_IN_BACKPACK)
-			if(!SEND_SIGNAL(back, COMSIG_TRY_STORAGE_INSERT, I, src, TRUE))
+			if(!back || !SEND_SIGNAL(back, COMSIG_TRY_STORAGE_INSERT, I, src, TRUE))
 				not_handled = TRUE
 		else
 			not_handled = TRUE