Handle new players correctly

nms-patches/PlayerList.patch

@@ -1,5 +1,5 @@
---- ../work/decompile-8eb82bde//net/minecraft/server/PlayerList.java	2015-02-04 19:28:55.770168901 +0000
-+++ src/main/java/net/minecraft/server/PlayerList.java	2015-02-04 19:28:55.774168901 +0000
+--- ../work/decompile-8eb82bde//net/minecraft/server/PlayerList.java	2015-02-04 20:32:58.938127185 +0000
++++ src/main/java/net/minecraft/server/PlayerList.java	2015-02-04 20:32:58.942127185 +0000
 @@ -18,6 +18,26 @@
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
@@ -57,7 +57,7 @@
          usercache.a(gameprofile);
          NBTTagCompound nbttagcompound = this.a(entityplayer);
 +        // CraftBukkit start - Better rename detection
-+        if (nbttagcompound.hasKey("bukkit")) {
++        if (nbttagcompound != null && nbttagcompound.hasKey("bukkit")) {
 +            NBTTagCompound bukkit = nbttagcompound.getCompound("bukkit");
 +            s = bukkit.hasKeyOfType("lastKnownName", 8) ? bukkit.getString("lastKnownName") : s;
 +        }