SMTP Exception Handler code needs to be more robust

`owner:rjsparks@nostrum.com` `resolution_fixed` `type_defect`   |    by rjsparks@nostrum.com

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Exception Type: 	AttributeError
Exception Value: 	

'SMTPException' object has no attribute 'original_msg'

Exception Location: 	/a/www/ietf-datatracker/web/ietf/utils/mail.py in smtp_error_user_warning, line 309

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_Issue migrated from trac:1409 at 2022-03-04 03:44:43 +0000_