Add missing error check when adding a magnet link to deluge (#2295)

* Add missing error check when adding a magnet link to deluge

* Fix typo.

src/NzbDrone.Core/Download/Clients/Deluge/Deluge.cs

@@ -35,6 +35,11 @@ namespace NzbDrone.Core.Download.Clients.Deluge
         {
             var actualHash = _proxy.AddTorrentFromMagnet(magnetLink, Settings);
 
+            if (actualHash.IsNullOrWhiteSpace())
+            {
+                throw new DownloadClientException("Deluge failed to add magnet " + magnetLink);
+            }
+
             if (!Settings.TvCategory.IsNullOrWhiteSpace())
             {
                 _proxy.SetLabel(actualHash, Settings.TvCategory, Settings);