feat(LibInputBackend): minimal linux boot with no input

src/Linux/Avalonia.LinuxFramebuffer/Input/LibInput/LibInputBackend.cs

@@ -1,16 +1,15 @@
 using System;
 using System.Collections.Generic;
-using System.ComponentModel;
 using System.IO;
 using System.Threading;
 using Avalonia.Input;
 using Avalonia.Input.Raw;
-using Avalonia.Threading;
 using static Avalonia.LinuxFramebuffer.Input.LibInput.LibInputNativeUnsafeMethods; 
 namespace Avalonia.LinuxFramebuffer.Input.LibInput
 {
     public class LibInputBackend : IInputBackend
     {
+        private const string LibInput = nameof(Logging.LogArea.X11Platform) + "/" + nameof(LibInput);
         private IScreenInfoProvider _screen;
         private IInputRoot _inputRoot;
         private readonly Queue<Action> _inputThreadActions = new Queue<Action>();
@@ -29,15 +28,21 @@ namespace Avalonia.LinuxFramebuffer.Input.LibInput
             new Thread(()=>InputThread(ctx)).Start();
         }
 
-        
-        
         private unsafe void InputThread(IntPtr ctx)
         {
             var fd = libinput_get_fd(ctx);
             
             var timeval = stackalloc IntPtr[2];
 
-
+            if (!Directory.Exists("/dev/input"))
+            {
+                if (Logging.Logger.IsEnabled(Logging.LogEventLevel.Warning,LibInput))
+                {
+                    Logging.Logger.TryGet(Logging.LogEventLevel.Warning, LibInput)
+                        ?.Log(this, "Not connect any input device.");
+                }
+                return;
+            }
             foreach (var f in Directory.GetFiles("/dev/input", "event*"))
                 libinput_path_add_device(ctx, f);
             while (true)