catch the correct exception after change

Author: helylle

src/eduid/scimapi/routers/utils/invites.py

@@ -127,7 +127,7 @@ def create_signup_ref(req: ContextRequest, db_invite: ScimApiInvite) -> SCIMRefe
 def send_invite_mail(req: ContextRequest, signup_invite: SignupInvite) -> bool:
     try:
         email = next(email.email for email in signup_invite.mail_addresses if email.primary)
-    except IndexError:
+    except StopIteration:
         # Primary not set
         email = signup_invite.mail_addresses[0].email
     link = f"{req.app.context.config.invite_url}/{signup_invite.invite_code}"