Changed asset CreatorID to a string

OpenSim/Data/SQLite/SQLiteAssetData.cs

@@ -235,7 +235,7 @@ namespace OpenSim.Data.SQLite
                 new UUID((String)row["UUID"]),
                 (String)row["Name"],
                 Convert.ToSByte(row["Type"]),
-                UUID.Zero
+                UUID.Zero.ToString()
             );
 
             asset.Description = (String) row["Description"];