fix: force choice of From address in Announcement form. Fixes #7679. (#7720)

ietf/secr/announcement/forms.py

@@ -42,8 +42,11 @@ def get_from_choices(user):
     nomcom_choices = get_nomcom_choices(user)
     if nomcom_choices:
         addresses = list(addresses) + nomcom_choices
-    
-    return list(zip(addresses, addresses))
+
+    choices = list(zip(addresses, addresses))
+    if len(choices) > 1:
+        choices.insert(0, ('', '(Choose an option)'))
+    return choices
 
 
 def get_nomcom_choices(user):

ietf/secr/announcement/tests.py

@@ -48,7 +48,7 @@ class SecrAnnouncementTestCase(TestCase):
         r = self.client.get(url)
         self.assertEqual(r.status_code, 200)
         q = PyQuery(r.content)
-        self.assertEqual(len(q('#id_frm option')),3)
+        self.assertEqual(len(q('#id_frm option')),4)
 
         # IAB Chair
         self.client.login(username="iab-chair", password="iab-chair+password")