LP#1749475 Improve error handling in send_event_email_output

LP#1749475 Improve error handling in send_event_email_output

This code was borrowed from a few other places, so it still had the
$stat variable, but wasn't doing anything with it.  We might as well
go a step further and borrow the error handling that variable is there
for.

Ultimately, email handling should probably moved out to a utility
function rather than spread about.

Signed-off-by: Dan Wells <dbw2@calvin.edu>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Signed-off-by: Michele Morgan <mmorgan@noblenet.org>