Don't crash if no storage is loaded

[Smart123s]

Summary of your change

If the pluign is running on Bukkit, and it's connected to Bungee
then core.getStorage() will be null.
If that's the case, players will be logged in via a plugin messages.

Related issue

#602 (comment)

[Smart123s]

Auto registering still didn't work for me, even when I used the commits from this PR.

I've noticed that the following line returned false:

https://github.com/games647/FastLogin/blob/7c125dc0b6d2a6904977d93e35b2673b7cef97ce/bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/BungeeListener.java#L107

If I had removed the if checking below that, then I was able to auto register:

https://github.com/games647/FastLogin/blob/7c125dc0b6d2a6904977d93e35b2673b7cef97ce/bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/BungeeListener.java#L109-L112

I don't fully understand what it does, so I don't want to touch it. Would it be safe to remove it for Floodgate players?

[TuxCoding]

It was necessary to add, because in Paper the Bungee message fires before the PlayerJoinEvent. However then the player isn't ready yet. So we have to detect which event fires later.

[Smart123s]

Ok, thanks for explaining, now I understand it. But where does the auto login/register happen if result is false?

[TuxCoding]

Here in the PlayerJoinEvent. If there is no login session, then the bungee task didn't run yet.

https://github.com/games647/FastLogin/blob/172efafc2bfe11ff2f6425f8b40be32918057c1d/bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/ConnectionListener.java#L92

[Smart123s]

I get it now, thanks. Although it seems like #606 (comment) was also fixed by #608.