[REALMS-212] After some input lag on my Realm, I tried logging out and back in. First it refused to reconnect, then Minecraft outright crashed.

Minecraft crashed when I tried to log back into my Realm

What I expected to happen was...:
I would log back into my Realm

What actually happened was...:
Minecraft crashed

Steps to Reproduce:
1. Noticed input lag while on my Realm(Destroy block, a moment for it to notice, then another moment for it to recognize that I had placed a new blog)
2. Logged off
3. Tried to log back on, got an error message(Forgot to write it down like an idiot)
4. Tried again
5. Minecraft crashed

Time: 11/14/16 8:53 PM
Description: Ticking screen

java.lang.NullPointerException: Ticking screen
	at er$a.a(SourceFile:387)
	at er.m(SourceFile:220)
	at er.a(SourceFile:229)
	at net.minecraft.realms.RealmsConnect.tick(SourceFile:105)
	at com.mojang.realmsclient.util.RealmsTasks$RealmsConnectTask.tick(RealmsTasks.java:435)
	at com.mojang.realmsclient.gui.screens.RealmsLongRunningMcoTaskScreen.tick(RealmsLongRunningMcoTaskScreen.java:44)
	at bgk.e(SourceFile:124)
	at beq.t(SourceFile:1598)
	at beq.av(SourceFile:967)
	at beq.a(SourceFile:395)
	at net.minecraft.client.main.Main.main(SourceFile:124)