Second part of correction #3997 (#4017)

- try/catch block for torrent parsing
Sonarr test button was failed because an invalid torrent.

src/Jackett.Common/Indexers/NCore.cs

@@ -129,9 +129,10 @@ namespace Jackett.Common.Indexers
 
                 // Check torrents only till we reach the query Limit 
                 for(int i=0; (i<rows.Length && ((already_founded + releases.Count) < limit )); i++)
+                { 
+                    try
                     {
                         CQ qRow = rows[i].Cq();
-
                         var key = dom["link[rel=alternate]"].First().Attr("href").Split('=').Last();
 
                         release = new ReleaseInfo();
@@ -212,7 +213,12 @@ namespace Jackett.Common.Indexers
                                 releases.Add(release);
                             }
                         }
-
+                    }
+                    catch (FormatException ex)
+                    { 
+                        logger.Error("Problem of parsing Torrent:" + rows[i].InnerHTML);
+                        logger.Error("Exception was the following:" + ex);
+                    }
                 }
             }
             catch (Exception ex)