Prevent failure to bind to Auto Discover port being a fatal error

Emby.Server.Implementations/EntryPoints/UdpServerEntryPoint.cs

@@ -47,9 +47,17 @@ namespace Emby.Server.Implementations.EntryPoints
 
         /// <inheritdoc />
         public Task RunAsync()
+        {
+            try
             {
                 _udpServer = new UdpServer(_logger, _appHost, _config);
                 _udpServer.Start(PortNumber, _cancellationTokenSource.Token);
+            }
+            catch (System.Net.Sockets.SocketException ex)
+            {
+                _logger.LogWarning($"Unable to start AutoDiscovery listener on UDP port {PortNumber} - {ex.Message}");
+            }
+
             return Task.CompletedTask;
         }