Update video file migration

courses/migrations/0030_videofile.py

-# Generated by Django 2.2.24 on 2021-07-26 17:27
+# Generated by Django 2.2.24 on 2021-07-26 19:22
 
 import courses.videos.models
 from django.db import migrations, models
@@ -16,9 +16,9 @@ class Migration(migrations.Migration):
             name='VideoFile',
             fields=[
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('name', models.CharField(max_length=255)),
+                ('name', models.CharField(max_length=255, null=True)),
                 ('file', models.FileField(default=None, null=True, upload_to=courses.videos.models.get_upload_path)),
-                ('video', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='file', to='courses.Video', verbose_name='file')),
+                ('video', models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='file', to='courses.Video', verbose_name='file')),
             ],
         ),
     ]

courses/migrations/0031_auto_20210726_1523.py

-# Generated by Django 2.2.24 on 2021-07-26 18:23
-
-from django.db import migrations, models
-import django.db.models.deletion
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('courses', '0030_videofile'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='videofile',
-            name='video',
-            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='file', to='courses.Video', verbose_name='file'),
-        ),
-    ]