'Empty strings in various recipient arguments are always stripped
off the final recipient list.'

def test_recipients_with_empty_strings(self):

    email = EmailMessage('Subject', 'Content', 'from@example.com', ['to@example.com', ''], cc=['cc@example.com', ''], bcc=['', 'bcc@example.com'], reply_to=['', None])
    self.assertEqual(email.recipients(), ['to@example.com', 'cc@example.com', 'bcc@example.com'])
