Teamsnap Availability Model fixes.

Accept null and blank for availability status code. Add the type property.
and migrations

teamsnap/migrations/0005_auto_20211228_1906.py

@@ -0,0 +1,50 @@
+# Generated by Django 3.2.6 on 2021-12-29 01:06
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('benchcoach', '0002_alter_player_jersey_number'),
+        ('teamsnap', '0004_auto_20211222_0957'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='availability',
+            name='benchcoach_object',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='teamsnap_object+', to='benchcoach.availability'),
+        ),
+        migrations.AlterField(
+            model_name='event',
+            name='benchcoach_object',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='teamsnap_object+', to='benchcoach.event'),
+        ),
+        migrations.AlterField(
+            model_name='lineupentry',
+            name='benchcoach_object',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='teamsnap_object+', to='benchcoach.positioning'),
+        ),
+        migrations.AlterField(
+            model_name='location',
+            name='benchcoach_object',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='teamsnap_object+', to='benchcoach.venue'),
+        ),
+        migrations.AlterField(
+            model_name='member',
+            name='benchcoach_object',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='teamsnap_object+', to='benchcoach.player'),
+        ),
+        migrations.AlterField(
+            model_name='opponent',
+            name='benchcoach_object',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='teamsnap_object+', to='benchcoach.team'),
+        ),
+        migrations.AlterField(
+            model_name='team',
+            name='benchcoach_object',
+            field=models.OneToOneField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='teamsnap_object+', to='benchcoach.team'),
+        ),
+    ]