fix: year can be null

.vscode/launch.json

@@ -0,0 +1,25 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "ocarina2",
+            "request": "launch",
+            "type": "dart"
+        },
+        {
+            "name": "ocarina2 (profile mode)",
+            "request": "launch",
+            "type": "dart",
+            "flutterMode": "profile"
+        },
+        {
+            "name": "ocarina2 (release mode)",
+            "request": "launch",
+            "type": "dart",
+            "flutterMode": "release"
+        },
+    ]
+}

lib/api/subsonic/album.dart

@@ -26,7 +26,7 @@ class Album {
   @JsonKey(name: "artist")
   final String artistName;
   final String artistId;
-  final int year;
+  final int? year;
   final int songCount;
   final List<String> genres;
   final int duration;

lib/api/subsonic/album.g.dart

@@ -13,7 +13,7 @@ Album _$AlbumFromJson(Map<String, dynamic> json) => Album(
       playCount: (json['playCount'] as num?)?.toInt() ?? 0,
       artistName: json['artist'] as String,
       artistId: json['artistId'] as String,
-      year: (json['year'] as num).toInt(),
+      year: (json['year'] as num?)?.toInt(),
       songCount: (json['songCount'] as num).toInt(),
       genres:
           (json['genres'] as List<dynamic>).map((e) => e as String).toList(),