[REQUEST] Event when there are no more online players in the server

[tioalexis]

Is your feature request related to a problem? Please describe.
I want to be able to run a command whenever a player leaves the server BUT only if there are no more players in the server.

Describe the solution you'd like
Possibly a server_empty event:

"server_empty": {
    "actions": [
        "nothing but chickens"
    ]
}

or a condition specifically for leave event:

"leave": {
    "actions": [
        "nothing but chickens",
        "/someServerCommandLikeBackup idk"
    ],
   "requiredOnlinePlayerCount": 0
}

Describe alternatives you've considered
I first tried this using execute command when the player leaves. It is possible to check if there are players in the server using execute if entity @a run someOtherCommand but there's no way to negate this condition (like a not option).

I understand this might be beyond the scope of this project (considering it's called "player" events) but I think this is still slightly relevant.

[IotaBread]

Thanks for the suggestion! I'll consider adding it in the next update