[paperwork] Fix various bugs in certification email sending

paperwork/admin.py

@@ -90,13 +90,13 @@ class CertificationAdmin(admin.ModelAdmin):
     def send_notifications(self, request, queryset):
         try:
             emails = list(all_certification_emails(queryset))
-            print(emails)
 
             with mail.get_connection() as conn:
                 conn.send_messages(emails)
 
             for cert in queryset:
-                cert.update(shop_lead_notified=Now())
+                cert.shop_lead_notified = Now()
+                cert.save()
 
             self.message_user(
                 request,

paperwork/certification_emails.py

@@ -88,7 +88,11 @@ def admin_email(ordered_queryset):
         f"{len(ordered_queryset)} new CMS Certifications issued",
         html_body,
         # TODO: Admin emails should probably be from a group, not all staff
-        to=[get_user_model().filter(is_staff=True).values("email", flat=True)],
+        to=(
+            get_user_model()
+            .objects.filter(is_staff=True)
+            .values_list("email", flat=True)
+        ),
     )