Add Product button does not throw any warning or information on what information is missing when pressed and all the fields are empty in IAP Catalog

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Install the In-App Purchasing package
3. Create a new IAP Button (GameObject > In-App Purchasing > IAP Button)
4. Open the IAP Catalog in the Inspector window
5. Click the "Add Product" button
6. Observe the IAP Catalog window

Actual results: The "Add Product" button can be clicked when all the fields are empty but does not do anything and does not provide any warning or information to the user on what is missing for it to be working

Expected results: The "Add Product" button is either disabled or a warning/information is provided to the user why it does not work

Reproducible with versions: 6000.0.60f1, 6000.2.8f1, 6000.3.0b7, 6000.4.0a3

Tested on (OS): MacOS Silicon Sequoia 15.6.1

Notes:

• This is not very informational and can lead to confusion for the users when the button can be clicked and there is no information relayed to the user why it does not work