It has been established that you are allowed to fail a specific deck search (e.g. getting no Basics out of the deck due to Great Ball, even though you have one or more in there). But for non-specific deck searches (e.g. Quick Search), are you REQUIRED to take a card? I would assume so, as "The Game" knows that you have card(s) in your deck. Is this correct? And similarly, you can't perform these actions with an empty deck?