For a scheduled report, is it possible not to attach the CSV file when there's no results, but when there are results, do attach the CSV file?
Looks like there's only this option in savedsearches.conf :
action.email.sendcsv = [1|0]
* Specify whether to send results as a CSV file.
* Default: 0
(or the 'sendcsv' setting in the alert_actions.conf file)
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