In the NHL, there's no question that this is allowed since in the NHL, players are allowed to stand in the crease so long as they don't interfere with the goalie. Seeing as there's no goalie in the net to interfere with, I don't see how it wouldn't be allowed. An exception to this is if one of the six defending players chooses to attempt to play goalie and stand in the net, an attacking player standing in the crease could be considered interference if they interfered with the defending player.
However, international hockey games are a different story. There's no official rule stating if you can or can't do so. There is however a crease violation, which is meant to protect goaltenders by not letting players come into the crease. This leads me to assume that it's the same rule as with the NHL, which means, yes, you're right. On an empty net, it's safe to assume that crease violations are void due to the nature of crease violations.
Please note that this is not definitive proof, and should not be taken as a guaranteed fact.