Don't try and lookup profiles that have no UUID and no name

Closes GH-347

Spigot-Server-Patches/Don-t-lookup-game-profiles-that-have-no-UUID-and-no-.patch

@@ -0,0 +1,20 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Zach Brown <1254957+zachbr@users.noreply.github.com>
+Date: Sat, 16 Jul 2016 19:11:17 -0500
+Subject: [PATCH] Don't lookup game profiles that have no UUID and no name
+
+
+diff --git a/src/main/java/net/minecraft/server/UserCache.java b/src/main/java/net/minecraft/server/UserCache.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/UserCache.java
++++ b/src/main/java/net/minecraft/server/UserCache.java
+@@ -0,0 +0,0 @@ public class UserCache {
+         };
+ 
+         gameprofilerepository.findProfilesByNames(new String[] { s}, Agent.MINECRAFT, profilelookupcallback);
+-        if (!d() && agameprofile[0] == null) {
++        if (!d() && agameprofile[0] == null && !org.apache.commons.lang3.StringUtils.isBlank(s)) { // Paper - Don't lookup a profile with a blank name
+             UUID uuid = EntityHuman.a(new GameProfile((UUID) null, s));
+             GameProfile gameprofile = new GameProfile(uuid, s);
+ 
+--