Well pusher's privilege for read_build could be removed

app/services/notification_service.rb

@@ -323,8 +323,10 @@ class NotificationService
       nil, # The acting user, who won't be added to recipients
       action: pipeline.status).map(&:notification_email)
 
+    if recipients.any?
       mailer.public_send(email_template, pipeline, recipients).deliver_later
     end
+  end
 
   protected