Merge remote-tracking branch 'kelseyhightower/kelseyhightower/ticket/2.7.x/9167_tagmail_report_sends_email_when_nothing_happens' into 2.7.x
- kelseyhightower/kelseyhightower/ticket/2.7.x/9167_tagmail_report_sends_email_when_nothing_happens: (#9167) Do not send email when nothing changes