I am working on a new workflow where a ticket is assigned after it is submitted, when an agent or a supervisor assigns the ticket the transition screen has an opportunity for them to add a "reply to customer" or internal comment, if the comment for reply to customer is blank or if they write an internal comment I want the automation to email the customer to let them know the ticket has been assigned but if they did add a comment to "reply to customer" this does not need to run because the comment will trigger to the customer.
My question is what action in the automation would I use?