Fix http://opensimulator.org/mantis/view.php?id=4224

This resolves the problem where eyes and hair would turn white on standalone configurations
When a client receives body part information, for some insane reason or other it always ends up uploading this back to the server and then immediately re-requesting it.
This should have been okay since we stored that asset in cache.  However, the standalone asset service connector was not checking this cache properly, so every time the client made the request for the asset it has just loaded it would get a big fat null back in the face, causing it to make clothes and hair white.
This bug did not affect grids since they use a different service connector.

OpenSim/Data/MySQL/MySQLUserData.cs

@@ -622,11 +622,6 @@ namespace OpenSim.Data.MySQL
             return false;
         }
 
-        /// <summary>
-        /// Appearance
-        /// TODO: stubs for now to get us to a compiling state gently
-        /// override
-        /// </summary>
         public override AvatarAppearance GetUserAppearance(UUID user)
         {
             try