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

Makefile

@@ -1,7 +1,7 @@
 all: lint-fix lint coverage gen
 
 coverage:
-	coverage run --concurrency=multiprocessing manage.py test --failfast
+	coverage run --concurrency=multiprocessing manage.py test --failfast -v 3
 	coverage combine
 	coverage html
 	coverage report

azure-pipelines.yml

@@ -139,7 +139,7 @@ stages:
             displayName: Run full test suite
             inputs:
               script: |
-                pipenv run coverage run ./manage.py test passbook
+                pipenv run coverage run ./manage.py test passbook -v 3
                 mkdir output-unittest
                 mv unittest.xml output-unittest/unittest.xml
                 mv .coverage output-unittest/coverage
@@ -181,7 +181,7 @@ stages:
           - task: CmdLine@2
             displayName: Run full test suite
             inputs:
-              script: pipenv run coverage run ./manage.py test e2e
+              script: pipenv run coverage run ./manage.py test e2e -v 3
           - task: CmdLine@2
             displayName: Prepare unittests and coverage for upload
             inputs:

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",
+            ),
+        ),
+    ]

passbook/providers/proxy/models.py

@@ -50,7 +50,7 @@ class ProxyProvider(OutpostModel, OAuth2Provider):
     cookie_secret = models.TextField(default=get_cookie_secret)
 
     certificate = models.ForeignKey(
-        CertificateKeyPair, on_delete=models.SET_NULL, null=True
+        CertificateKeyPair, on_delete=models.SET_NULL, null=True, blank=True,
     )
 
     def form(self) -> Type[ModelForm]: