stages/email: don't crash when testing stage does not exist

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/stages/consent/tests.py

@@ -1,7 +1,6 @@
 """consent tests"""
 from time import sleep
 
-from django.http.response import HttpResponse
 from django.urls import reverse
 from django.utils.encoding import force_str
 from rest_framework.test import APITestCase
@@ -41,12 +40,14 @@ class TestConsentStage(APITestCase):
         session = self.client.session
         session[SESSION_KEY_PLAN] = plan
         session.save()
-        response: HttpResponse = self.client.post(
+        response = self.client.post(
             reverse("authentik_api:flow-executor", kwargs={"flow_slug": flow.slug}),
             {},
         )
+        # pylint: disable=no-member
         self.assertEqual(response.status_code, 200)
         self.assertJSONEqual(
+            # pylint: disable=no-member
             force_str(response.content),
             {
                 "component": "xak-flow-redirect",

authentik/stages/email/management/commands/test_email.py

@@ -16,7 +16,11 @@ class Command(BaseCommand):  # pragma: no cover
         """Send a test-email with global settings"""
         delete_stage = False
         if options["stage"]:
-            stage = EmailStage.objects.get(name=options["stage"])
+            stages = EmailStage.objects.filter(name=options["stage"])
+            if not stages.exists():
+                print(f"Stage '{options['stage']}' does not exist")
+                return
+            stage = stages.first()
         else:
             stage = EmailStage.objects.create(
                 name=f"temp-global-stage-{uuid4()}", use_global_settings=True