Empty world with Worlds plugin?

How can I create empty world using Worlds plugin or without it?

 

Setting the generatorName to flat and the generatorOptions to 0;0;0 used to generate a world filled with air blocks.

Anyway, seems like you need it to be "empty" which is a lot different from "filled with air".

To "create" an empty world you just don't generate it and spawn the player sending no chunks at all, this is way faster. You may have to modify the server code though

 

I dont really know whats the diffrence betwen "empty" and "filled with air"... I just want to create my hub in the air and void surrounding it...