Don't try and resolve user account for authorization if the agent has come in via hypergrid.

If a user account isn't available, this just passes on the name given by the agent instead.
I'm not sure this is particularly useful since I believe that agent names could be faked in this context - it might be no more useful than a viewer agent string.
In fact, there might even be an argument that passing on this name provides a false expectation of authenticity.  However, I will apply for now.
Patch applied from http://opensimulator.org/mantis/view.php?id=5696
Thanks Michelle Argus.

OpenSim/Region/CoreModules/ServiceConnectorsOut/Authorization/RemoteAuthorizationServiceConnector.cs

@@ -141,11 +141,21 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Authorization
             
             if (scene != null)
             {
+                string mail = String.Empty;
+                
                 UserAccount account = scene.UserAccountService.GetUserAccount(UUID.Zero, new UUID(userID));
 
+                //if account not found, we assume its a foreign visitor from HG, else use account data...
+                if (account != null)
+                {
+                    mail = account.Email;
+                    firstName = account.FirstName;
+                    lastName = account.LastName;
+                }
+
                 isAuthorized
                     = IsAuthorizedForRegion(
-                        userID, firstName, lastName, account.Email, scene.RegionInfo.RegionName, regionID, out message);
+                        userID, firstName, lastName, mail, scene.RegionInfo.RegionName, regionID, out message);
             }
             else
             {