Fixed: Default List for Cardigann LegacyLinks

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

@@ -29,6 +29,11 @@ namespace NzbDrone.Core.Indexers.Cardigann
     // Cardigann yaml classes
     public class CardigannDefinition
     {
+        public CardigannDefinition()
+        {
+            Legacylinks = new List<string>();
+        }
+
         public string Id { get; set; }
         public List<SettingsField> Settings { get; set; }
         public string Name { get; set; }

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

@@ -4,6 +4,11 @@ namespace NzbDrone.Core.Indexers.Cardigann
 {
     public class CardigannMetaDefinition
     {
+        public CardigannMetaDefinition()
+        {
+            Legacylinks = new List<string>();
+        }
+
         public string Id { get; set; }
         public string File { get; set; }
         public string Name { get; set; }