Alert when trying to email a receipt to an account without an email address
Currently, if you try to send an email receipt to an account that doesn't have an email address, you still get a green check mark saying the email has been sent and a task will be created and linked to the gift. The only distinction is that the task will be left incomplete.
This is easy to miss, so it would be helpful if the system gave some sort of alert letting you know that you are attempting to email an account without an email.