Minor update, as this wouldn't cause any issues on a server.

- Fixed a NPE when a player tried to type more than 3 arguments.
(Example: /fm fs ServerA ServerB Extra)
The extra argument would cause a NPE, because bungee's tab complete does not work the same as spigot.

This error would rarely be seen, as it only happens when people try to add more arguments than what is needed, and it causes no more harm than some scary text in the console. Either way, it's fixed in this minor update