Customer's comment on this issue:
Can we provide different color for the tabs with no information in deck of cards. I am using macro in different cards to pick data from different page? But to know that I need to click each and every tab and find if the data has been fetched from pages? So, it is better to highlight in different color if there is data in the tab.
Due to inpopularity fo this request, we don't have any plan to implement this in the next 6 months. Will consider re-opening if there's more requests.