fix playlist videos can blank

apps/core/migrations/0003_alter_playlist_videos_alter_video_local_file.py

+# Generated by Django 4.1.7 on 2023-03-21 11:17
+
+import apps.core.utils
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0002_category_tag_alter_video_options_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='playlist',
+            name='videos',
+            field=models.ManyToManyField(blank=True, related_name='playlist', to='core.video'),
+        ),
+        migrations.AlterField(
+            model_name='video',
+            name='local_file',
+            field=models.FileField(blank=True, null=True, upload_to=apps.core.utils.asset_upload, verbose_name='local file'),
+        ),
+    ]

apps/core/models.py

@@ -165,7 +165,7 @@ class Video(BaseModel):
 class Playlist(BaseModel):
     title = models.CharField(_('title'), max_length=255)
     description = models.TextField(_('description'), blank=True, null=True)
-    videos = models.ManyToManyField(Video, related_name='playlist')
+    videos = models.ManyToManyField(Video, related_name='playlist', blank=True)
     sort = models.CharField(choices=SORT_CHOICES, max_length=255, blank=True)
     type = models.CharField(choices=TYPE_CHOICES, max_length=255, blank=True)
     mrss = models.CharField(_('mrss'), max_length=255, blank=True, null=True)