Fixed bug with item generator crying when item is removed while its broken

scripts/item_generator/state/broken.gd

@@ -30,7 +30,7 @@ func on_gen_timer_timeout():
 	assert(false, "gen timer should be disabled while broken")
 
 func on_item_slot_item_changed(item):
-	assert(false, "item dump should be disabled while broken")
+	assert(item == null, "item dump adds should be disabled while broken")
 
 func on_item_dump_item_dump_completed():
 	ctx.full_heal()