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fix(massEmails): no error on empty test user list DEV-562 (#5830)

### 📣 Summary
Do not attempt to send emails when the test email configuration is
empty.



### 📖 Description
Fixes an error wherein if the `MASS_EMAIL_TEST_EMAILS` configuration in
Constance was empty, any email using the `test_users` query would throw
errors, which could kill the whole process and prevent other emails from
sending.


### 👀 Preview steps
Remember to restart the kpi_worker after switching branches

1. In Constance, reset `MASS_EMAIL_TEST_EMAILS` to default
2. Create a MassEmailConfig that uses the `test_users` query and set it
to live
3. 🔴 [on main] At one minute after the next 15 m boundary the send
process will fail
4. 🟢 [on PR] No errors in kpi_worker

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