Handle exception if log file do not exists.

BTCPayServer/Controllers/ServerController.cs

@@ -666,18 +666,24 @@ namespace BTCPayServer.Controllers
                 if (string.IsNullOrEmpty(file)) return View("Logs", vm);
                 vm.Log = "";
                 var path = Path.Combine(di.FullName, file);
-
-                using (var fileStream = new FileStream(
-                    path,
-                    FileMode.Open,
-                    FileAccess.Read,
-                    FileShare.ReadWrite))
+                try
                 {
-                    using (var reader = new StreamReader(fileStream))
+                    using (var fileStream = new FileStream(
+                        path,
+                        FileMode.Open,
+                        FileAccess.Read,
+                        FileShare.ReadWrite))
                     {
-                        vm.Log = await reader.ReadToEndAsync();
+                        using (var reader = new StreamReader(fileStream))
+                        {
+                            vm.Log = await reader.ReadToEndAsync();
+                        }
                     }
                 }
+                catch
+                {
+                    return NotFound();
+                }
             }
 
             return View("Logs", vm);