Fixed: (Cardigann) Handle json field selector that returns arrays

Closes #950

src/NzbDrone.Core/Indexers/Definitions/Cardigann/CardigannBase.cs

@@ -256,8 +256,17 @@ namespace NzbDrone.Core.Indexers.Cardigann
                     return null;
                 }
 
+                if (selection.Type is JTokenType.Array)
+                {
+                    // turn this json array into a comma delimited string
+                    var valueArray = selection.Value<JArray>();
+                    value = string.Join(",", valueArray);
+                }
+                else
+                {
                     value = selection.Value<string>();
                 }
+            }
 
             if (selector.Case != null)
             {