* Stop an exception in the thread tracker cleanup loop from terminating the sim

OpenSim/Framework/ThreadTracker.cs

@@ -52,6 +52,8 @@ namespace OpenSim.Framework
         }
 
         private static void ThreadTrackerThreadLoop()
+        {            
+            try
             {
                 while (true)
                 {
@@ -59,6 +61,13 @@ namespace OpenSim.Framework
                     CleanUp();
                 }
             }
+            catch (Exception e)
+            {
+                m_log.ErrorFormat(
+                    "[THREAD TRACKER]: Thread tracker cleanup thread terminating with exception.  Please report this error.  Exception is {0}", 
+                    e);                
+            }                
+        }
 
         public static void Add(Thread thread)
         {