🥅 newsletter import: show error message when no email template is found

fragdenstaat_de/fds_newsletter/forms.py

@@ -2,12 +2,14 @@
 
 from django import forms
 from django.conf import settings
-from django.forms import ModelForm
+from django.forms import ModelForm, ValidationError
 from django.utils.translation import gettext_lazy as _
 
 from froide.helper.spam import SpamProtectionMixin
 from froide.helper.widgets import BootstrapCheckboxSelectMultiple, BootstrapRadioSelect
 
+from fragdenstaat_de.fds_mailing.models import EmailTemplate
+
 from .models import Newsletter, Subscriber, UnsubscribeFeedback
 from .utils import import_csv, subscribe, subscribed_newsletters
 
@@ -154,6 +156,24 @@ class SubscriberImportForm(forms.Form):
         label=_("Email addresses are confirmed"), required=False
     )
 
+    def clean_email_confirmed(self):
+        email_confirmed = self.cleaned_data["email_confirmed"]
+
+        if not email_confirmed:
+            try:
+                EmailTemplate.objects.get(
+                    mail_intent="fds_newsletter/email/subscriber_batch_confirm",
+                    active=True,
+                )
+            except (EmailTemplate.DoesNotExist, EmailTemplate.MultipleObjectsReturned):
+                raise ValidationError(
+                    _(
+                        "Make sure there exists one active mailing template for the batch confirm intent (fds_newsletter/email/subscriber_batch_confirm)."
+                    )
+                ) from None
+
+        return email_confirmed
+
     def save(self, newsletter):
         csv_file = self.cleaned_data["csv_file"]
         csv_file = StringIO(csv_file.read().decode("utf-8"))