If you need reports sent ONLY when conditions are met (like "don't send an empty report, only send when there is data in it"), vote up this idea to ensure this parity feature comes to Lightning from Classic.  Here's what you can do in Classic today, and we need it in Lightning: When you subscribe to a report, you can define the set of conditions to meet before sending a notification, and choose how and when to be notified   @* Customer Success * 

Idea: Ability to add conditions to when subscribed reports are sent