[MC-4144] Player disconnected without connecting

Running a vanilla server, I see this output in my console:

list
2012-12-04 12:13:19 [INFO] There are 0/20 players online:
2012-12-04 12:13:19 [INFO] 
2012-12-05 00:00:01 [INFO] Rcon connection from: /0:0:0:0:0:0:0:1
2012-12-05 00:00:01 [INFO] [Rcon: Saved the world]
2012-12-05 00:00:01 [INFO] Rcon connection from: /0:0:0:0:0:0:0:1
2012-12-05 00:00:01 [INFO] [Rcon: Turned off world auto-saving]
2012-12-05 00:02:22 [INFO] Rcon connection from: /0:0:0:0:0:0:0:1
2012-12-05 00:02:22 [INFO] [Rcon: Turned on world auto-saving]
2012-12-05 00:02:22 [INFO] Rcon connection from: /0:0:0:0:0:0:0:1
2012-12-05 00:02:22 [INFO] [Rcon: Saved the world]
2012-12-05 00:02:22 [INFO] Rcon connection from: /0:0:0:0:0:0:0:1
2012-12-05 00:02:22 [INFO] [Rcon: Turned off world auto-saving]
2012-12-05 00:11:20 [INFO] Rcon connection from: /0:0:0:0:0:0:0:1
2012-12-05 00:11:20 [INFO] [Rcon: Turned on world auto-saving]
2012-12-05 00:31:13 [INFO] <username elided> [/<ip address elided>:50586] lost connection
list
2012-12-05 00:39:55 [INFO] There are 0/20 players online:
2012-12-05 00:39:55 [INFO]

So there were no players on the server, then some time passed during which no players joined the server, then a player disconnected.