Added checks for failed UpdateAgent calls.

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -3903,6 +3903,8 @@ namespace OpenSim.Region.Framework.Scenes
             m_log.DebugFormat(
                 "[SCENE]: Incoming child agent update for {0} in {1}", cAgentData.AgentID, RegionInfo.RegionName);
 
+            // XPTO: if this agent is not allowed here as root, always return false
+
             // We have to wait until the viewer contacts this region after receiving EAC.
             // That calls AddNewClient, which finally creates the ScenePresence
             ScenePresence childAgentUpdate = WaitGetScenePresence(cAgentData.AgentID);