Support setting uuid's on ServerPing.PlayerInfo + fix plugins which don't provide a valid uuid.

api/src/main/java/net/md_5/bungee/api/ServerPing.java

@@ -3,6 +3,9 @@ package net.md_5.bungee.api;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
+import net.md_5.bungee.Util;
+
+import java.util.UUID;
 
 /**
  * Represents the standard list data returned by opening a server in the
@@ -42,7 +45,32 @@ public class ServerPing
     {
 
         private String name;
-        private String id;
+        private UUID uniqueId;
+
+        private static final UUID md5UUID = Util.getUUID( "af74a02d19cb445bb07f6866a861f783" );
+
+        public PlayerInfo(String name, String id)
+        {
+            setName( name );
+            setId( id );
+        }
+
+        public void setId(String id)
+        {
+            try
+            {
+                uniqueId = Util.getUUID( id );
+            } catch ( Exception e )
+            {
+                // Fallback on a valid uuid otherwise Minecraft complains
+                uniqueId = md5UUID;
+            }
+        }
+
+        public String getId()
+        {
+            return uniqueId.toString().replaceAll( "-", "" );
+        }
     }
     private String description;
     private String favicon;