Added checker for deleted playlists and albums

checkdb.sh

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+dart scripts/checker.dart > checker.txt

scripts/checker.dart

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+// ignore_for_file: avoid_print
+
+import 'package:musify/DB/albums.db.dart';
+import 'package:musify/DB/playlists.db.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+
+final _yt = YoutubeExplode();
+List playlists = [...playlistsDB, ...albumsDB];
+
+void main() async {
+  print('PLAYLISTS AND ALBUMS CHECKING RESULT:');
+  print('      ');
+  for (final playlist in playlists) {
+    final plist = await _yt.playlists.get(playlist['ytid']);
+
+    if (plist.videoCount == null) {
+      if (playlist['isAlbum'] != null && playlist['isAlbum']) {
+        print('> The album with the ID ${playlist['ytid']} does not exist.');
+      } else {
+        print('> The playlist with the ID ${playlist['ytid']} does not exist.');
+      }
+    }
+  }
+  print('      ');
+  print('The checking process is done');
+}