Level doesnt exist check?

[hotrian]

NPC Code:

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copylevel orilevel.nw,folder/newlevel.nw; Copies orilevel.nw to folder/newlevel.nw

deletelevel level.nw; deletes level.nw 

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To reduce lag it would make sence to delete a copied level
Im sure that G2K2 doesnt have 10000 Dungeon levels
It would make sence to " if {playerscount<1} deletelevel #L; "

But then if I logged out then logged back in, the level would be gone

Is there a way to detect if the player is on a level that doesnt exist?
Sence if you log onto a level that has been deleted
it stops at "loading player attributes"

(Yes i do know that those commands are serverside...)

-Edit
I suppose it could also be done by checking who was in the level
then checking if they are all online or not
and like rechecking every 30 seconds or something