log exceptions that end up at the top of a asynchronous viewer packet method call rather than swallowing them

OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs

@@ -669,8 +669,18 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         public void ProcessSpecificPacketAsync(object state)
         {
             AsyncPacketProcess packetObject = (AsyncPacketProcess)state;
+
+            try
+            {
                 packetObject.result = packetObject.Method(packetObject.ClientView, packetObject.Pack);
             }
+            catch (Exception e)
+            {
+                // Make sure that we see any exception caused by the asynchronous operation.
+                m_log.Error(
+                    string.Format("[LLCLIENTVIEW]: Caught exception while processing {0}", packetObject.Pack), e);
+            }            
+        }
 
         #endregion Packet Handling