For all these occasions the possibility of defining images highlighted " by default ", without interaction from the user, and that the item we use always show something.
And a special case, is whether we want to define a default featured picture depending on the category of entry. That, incidentally, is a really interesting and useful possibility that the article did not cover how to add thumbnails by default on all inputs .
To achieve this we have the perfect assistant ...
Default thumbnail Plus plugin is a very completito while simple, with the difference that you can set default images for each category, which is a "plus" important.
It is a widely used plugin portals especially in technology, to identify issues on the cover, depending on the category, its main virtue.