providers/proxy: fix provider requiring a certificate to be selected

passbook/providers/proxy/migrations/0005_auto_20200914_1536.py

@@ -0,0 +1,25 @@
+# Generated by Django 3.1.1 on 2020-09-14 15:36
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("passbook_crypto", "0002_create_self_signed_kp"),
+        ("passbook_providers_proxy", "0004_auto_20200913_1947"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="proxyprovider",
+            name="certificate",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                to="passbook_crypto.certificatekeypair",
+            ),
+        ),
+    ]