In the navigation bar, the application name has been changed to Whitley and there are now only two links: customers and movies.
The customers page has a table with a list of customers, which are currently hard-coded and not coming from a database.
Clicking on a customer in the list takes you to a details page for that customer. However, if the customer ID does not exist, a 404 error page is displayed.
For this exercise, you need to cater for various situations like when a customer is present versus when there are no customers. You also need to make similar changes for the list of movies.
Make use of what you have learned in this section to implement these features. Refer to the attached PDF for additional materials that will help you with this exercise.
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