Handle empty tags for videos and channels

Jellyfin.Plugin.TubeArchivistMetadata/TubeArchivist/Channel.cs

@@ -70,6 +70,7 @@ namespace Jellyfin.Plugin.TubeArchivistMetadata.TubeArchivist
         /// Gets channel tags.
         /// </summary>
         [JsonProperty(PropertyName = "channel_tags")]
+        [JsonConverter(typeof(TagsJsonConverter))]
         public Collection<string> Tags { get; }
 
         /// <summary>

Jellyfin.Plugin.TubeArchivistMetadata/TubeArchivist/TagsJsonConverter.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.ObjectModel;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace Jellyfin.Plugin.TubeArchivistMetadata.TubeArchivist
+{
+    /// <summary>
+    /// Custom JsonConverter to handle tags list that could be null.
+    /// </summary>
+    public class TagsJsonConverter : JsonConverter
+    {
+        /// <inheritdoc/>
+        public override bool CanConvert(Type objectType)
+        {
+            return objectType == typeof(Collection<string>);
+        }
+
+        /// <inheritdoc/>
+        public override object? ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer)
+        {
+            JToken token = JToken.Load(reader);
+            var tags = new Collection<string>();
+
+            if (token.Type == JTokenType.Array)
+            {
+                var stringArray = token.ToObject<string[]>();
+                if (stringArray != null)
+                {
+                    foreach (var tag in stringArray)
+                    {
+                        tags.Add(tag);
+                    }
+                }
+            }
+
+            return tags;
+        }
+
+        /// <inheritdoc/>
+        public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
+        {
+            var tags = (Collection<string>)(value ?? Array.Empty<string>());
+
+            writer.WriteStartArray();
+            foreach (var tag in tags)
+            {
+                writer.WriteValue(tag);
+            }
+
+            writer.WriteEndArray();
+        }
+    }
+}

Jellyfin.Plugin.TubeArchivistMetadata/TubeArchivist/Video.cs

@@ -54,6 +54,7 @@ namespace Jellyfin.Plugin.TubeArchivistMetadata.TubeArchivist
         /// Gets video tags.
         /// </summary>
         [JsonProperty(PropertyName = "tags")]
+        [JsonConverter(typeof(TagsJsonConverter))]
         public Collection<string> Tags { get; }
 
         /// <summary>