Avoid unhandled exception handlers logging into disposed sawmills on …

…shutdown

This caused a crash & exception swallow on Salamander.

Robust.Server/Program.cs

@@ -126,13 +126,29 @@ internal static void SetupLogging(IDependencyCollection deps)
             AppDomain.CurrentDomain.UnhandledException += (sender, args) =>
             {
                 var message = ((Exception) args.ExceptionObject).ToString();
-                uh.Log(args.IsTerminating ? LogLevel.Fatal : LogLevel.Error, message);
+                try
+                {
+                    uh.Log(args.IsTerminating ? LogLevel.Fatal : LogLevel.Error, message);
+                }
+                catch (ObjectDisposedException)
+                {
+                    // Avoid eating the exception if it's during shutdown and the sawmill is already gone.
+                    System.Console.WriteLine($"UnhandledException but sawmill is disposed! {message}");
+                }
             };
 
             var uo = mgr.GetSawmill("unobserved");
             TaskScheduler.UnobservedTaskException += (sender, args) =>
             {
-                uo.Error(args.Exception!.ToString());
+                try
+                {
+                    uo.Error(args.Exception!.ToString());
+                }
+                catch (ObjectDisposedException)
+                {
+                    // Avoid eating the exception if it's during shutdown and the sawmill is already gone.
+                    System.Console.WriteLine($"UnobservedTaskException but sawmill is disposed! {args.Exception}");
+                }
 #if EXCEPTION_TOLERANCE
                 args.SetObserved(); // don't crash
 #endif