some small changes, like adding a couple of extra methods to IInventoryServices so that a check can be done to see if a inventory set exists for a certain user.

OpenSim/Framework/Communications/IInventoryServices.cs

@@ -44,6 +44,8 @@ namespace OpenSim.Framework.Communications
         void AddNewInventoryItem(LLUUID userID, InventoryItemBase item);
         void DeleteInventoryItem(LLUUID userID, InventoryItemBase item);
         void CreateNewUserInventory(LLUUID user);
+        bool HasInventoryForUser(LLUUID userID);
+        InventoryFolderBase RequestRootFolder(LLUUID userID);
 
         /// <summary>
         /// Returns the root folder plus any folders in root (so down one level in the Inventory folders tree)

OpenSim/Framework/Communications/InventoryServiceBase.cs

@@ -194,6 +194,16 @@ namespace OpenSim.Framework.Communications
             }
         }
 
+        public virtual bool HasInventoryForUser(LLUUID userID)
+        {
+            return false;
+        }
+
+        public InventoryFolderBase RequestRootFolder(LLUUID userID)
+        {
+            return RequestUsersRoot(userID);
+        }
+
         /// <summary>
         /// 
         /// </summary>

OpenSim/Region/Communications/Local/LocalInventoryService.cs

@@ -83,6 +83,20 @@ namespace OpenSim.Region.Communications.Local
             DeleteItem(item);
         }
 
+        public override bool HasInventoryForUser(LLUUID userID)
+        {
+            InventoryFolderBase root = RequestUsersRoot(userID);
+            if (root == null)
+            {
+                return false;
+            }
+            else
+            {
+                return true;
+            }
+        }
+
+
         /// <summary>
         /// Send the given inventory folder and its item contents back to the requester.
         /// </summary>

OpenSim/Region/Communications/OGS1/OGS1InventoryService.cs

@@ -163,6 +163,16 @@ namespace OpenSim.Region.Communications.OGS1
                 "POST", _inventoryServerUrl + "/DeleteItem/", item);
         }
 
+        public bool HasInventoryForUser(LLUUID userID)
+        {
+            return false;
+        }
+
+        public InventoryFolderBase RequestRootFolder(LLUUID userID)
+        {
+            return null;
+        }
+
         public void CreateNewUserInventory(LLUUID user)
         {
         }