Sends an email to the configured error email, if it's configured.

def send_error_email(subject, message, additional_recipients=None):
    """
    Sends an email to the configured error email, if it's configured.
    """
    recipients = _email_recipients(additional_recipients)
    sender = email().sender
    send_email(
        subject=subject,
        message=message,
        sender=sender,
        recipients=recipients
    )