Hardbay: fix error on no results

src/Jackett/Indexers/Hardbay.cs

@@ -90,6 +90,8 @@ namespace Jackett.Indexers
             {
                 //var json = JArray.Parse(results.Content);
                 dynamic json = JsonConvert.DeserializeObject<dynamic>(results.Content);
+                if (json != null) // no results
+                { 
                     foreach (var row in json)
                     {
                         var release = new ReleaseInfo();
@@ -136,6 +138,7 @@ namespace Jackett.Indexers
                         releases.Add(release);
                     }
                 }
+            }
             catch (Exception ex)
             {
                 OnParseError(results.Content, ex);