fixed dummy download service

code/Infrastructure/Verticals/DownloadClient/DummyDownloadService.cs

@@ -12,8 +12,13 @@ using Microsoft.Extensions.Options;
 
 namespace Infrastructure.Verticals.DownloadClient;
 
-public sealed class DummyDownloadService : DownloadService
+public class DummyDownloadService : DownloadService
 {
+    /// <inheritdoc/>
+    public DummyDownloadService()
+    {
+    }
+    
     public DummyDownloadService(ILogger<DownloadService> logger, IOptions<QueueCleanerConfig> queueCleanerConfig, IOptions<ContentBlockerConfig> contentBlockerConfig, IOptions<DownloadCleanerConfig> downloadCleanerConfig, IMemoryCache cache, IFilenameEvaluator filenameEvaluator, IStriker striker, NotificationPublisher notifier) : base(logger, queueCleanerConfig, contentBlockerConfig, downloadCleanerConfig, cache, filenameEvaluator, striker, notifier)
     {
     }

code/Infrastructure/Verticals/DownloadClient/QBittorrent/QBitService.cs

@@ -245,6 +245,12 @@ public class QBitService : DownloadService, IQBitService
             {
                 TorrentProperties? torrentProperties = await _client.GetTorrentPropertiesAsync(download.Hash);
 
+                if (torrentProperties is null)
+                {
+                    _logger.LogDebug("failed to find torrent properties in the download client | {name}", download.Name);
+                    return;
+                }
+                
                 bool isPrivate = torrentProperties.AdditionalData.TryGetValue("is_private", out var dictValue) &&
                                  bool.TryParse(dictValue?.ToString(), out bool boolValue)
                                  && boolValue;