Java unit testing, get more data from assertion in loop

I'm doing a unit test on a network service that returns hundreds of products. During my test today, one of this products is missing a field.

Because one product is missing a field my assertion fails (succeeds at finding the error, so it depends on how you see it), but what I want to know is which product is the one having the issue.

Here's my assertion code:

for (Catalog catalog : mCatalogs.catalogs) {
    if (catalog.products != null && !catalog.products.isEmpty())
    {
        for (Product product : catalog.products) {
            assertNotNull(product.sku);
            assertNotNull(product.title);
            assertNotNull(product.localeName);
            assertNotNull(product.description);
            assertNotNull(product.fullImage);
            assertNotNull(product.statusCode);
        }
    }
}

one of the products does not have the field localName

Is there a way to output to the command line a string with something like

"product " + product.title + " failed" ?

If so, how?

Thank you!