Check for players online before spawning

[ejamesdba]

Great plug-in!

I was hoping you might be able to add either an option, or just a check, to avoid spawning in a new chest when no players are currently online. This is more of an issue now when the removeLoot is still throwing an exception, but even down the road a min-users option might be nice to make sure there is some competition online before a chest spawn.

[Arckenver]

Good idea !