Fix BanList command and other *list functionality

By: md_5 <git@md-5.net>

CraftBukkit-Patches/0139-Validate-CraftSkull-getOwner.patch

@@ -0,0 +1,21 @@
+From 36a609b6a7bf7ad658a1018997921c7bd0faf612 Mon Sep 17 00:00:00 2001
+From: md_5 <git@md-5.net>
+Date: Wed, 16 Apr 2014 09:46:48 +1000
+Subject: [PATCH] Validate CraftSkull getOwner
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftSkull.java b/src/main/java/org/bukkit/craftbukkit/block/CraftSkull.java
+index d544760..29778c0 100644
+--- a/src/main/java/org/bukkit/craftbukkit/block/CraftSkull.java
++++ b/src/main/java/org/bukkit/craftbukkit/block/CraftSkull.java
+@@ -146,6 +146,7 @@ public class CraftSkull extends CraftBlockState implements Skull {
+     }
+ 
+     public String getOwner() {
++        com.google.common.base.Preconditions.checkState( hasOwner(), "Cannot call getOwner if skull has no owner!" ); // Spigot
+         return profile.getName();
+     }
+ 
+-- 
+1.8.3.2
+