Not Draining At All

I checked all the main/working components, the line, etc. Then got to the disposal and realized the customer’s had installed a new one and forgot to punch out the drain tab for the dishwasher. Please be sure to check these simple things and save yourself a trip. I’m starting to ask this now when they call in with dishwashers not draining. Just a reminder for all you repair technicians that will read this forum.