Bug - Card view demo - the mock fetch is not working

[tlabaj]

Describe the problem
A clear and concise description of the problem. Which components are affected?

There is a regression in he "Card view demo (under patterns in the side nav)". The cards are not bing displayed because the mock data is not being fetched.

How do you reproduce the problem?
Look at the "Card view" pattern (demo)

Expected behavior
A clear and concise description of the expected behavior
This is how the demo appeared before.