Check for Blank OfflinePlayer Names - the internal representation does not allow them, so lets catch it early when the issue lies with the user.

CraftBukkit-Patches/0137-Check-for-blank-OfflinePlayer-Names.patch

@@ -0,0 +1,21 @@
+From ffc8031afadcab95da7bf7991fa4903265de4e77 Mon Sep 17 00:00:00 2001
+From: md_5 <git@md-5.net>
+Date: Mon, 14 Apr 2014 17:21:24 +1000
+Subject: [PATCH] Check for blank OfflinePlayer Names
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+index c30197b..9f0517b 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+@@ -1304,6 +1304,7 @@ public final class CraftServer implements Server {
+ 
+     public OfflinePlayer getOfflinePlayer(String name) {
+         Validate.notNull(name, "Name cannot be null");
++        com.google.common.base.Preconditions.checkArgument( !org.apache.commons.lang.StringUtils.isBlank( name ), "Name cannot be blank" ); // Spigot
+ 
+         OfflinePlayer result = getPlayerExact(name);
+         if (result == null) {
+-- 
+1.8.3.2
+