Fixed TorrentBlackhole failing fatally on magnet link instead of falling back to torrent url.

src/NzbDrone.Common/Http/HttpClient.cs

@@ -115,7 +115,7 @@ namespace NzbDrone.Common.Http
                 response.StatusCode == HttpStatusCode.MovedPermanently ||
                 response.StatusCode == HttpStatusCode.Found))
             {
-                throw new Exception("Server requested a redirect to [" + response.Headers["Location"] + "]. Update the request URL to avoid this redirect.");
+                _logger.Error("Server requested a redirect to [" + response.Headers["Location"] + "]. Update the request URL to avoid this redirect.");
             }
 
             if (!request.SuppressHttpError && response.HasHttpError)

src/NzbDrone.Core/Download/TorrentClientBase.cs

@@ -70,7 +70,14 @@ namespace NzbDrone.Core.Download
 
             if (magnetUrl.IsNotNullOrWhiteSpace())
             {
-                hash = DownloadFromMagnetUrl(remoteEpisode, magnetUrl);
+                try
+                {
+                    hash = DownloadFromMagnetUrl(remoteEpisode, magnetUrl);
+                }
+                catch (NotSupportedException ex)
+                {
+                    _logger.Debug("Magnet not supported by download client, trying torrent. ({0})", ex.Message);
+                }
             }
 
             if (hash == null && !torrentUrl.IsNullOrWhiteSpace())