Doing without a description is lazy and stupid.
It is used in the actual search ranking, and it is far more than a slug that shows up in search engines.
The description is a hinge pin and one of the most important pieces of on page SEO, and doing without it will hurt your ranking and traffic both.
The description is used by search engines to better determine what the page content is. If the description supports the title, and the heading tags support the description (and title), then you are halfway there with on page SEO.
This is especially important if the terminology on your page has multiple meanings.
Take for instance a site on "Jitterbug".
To many people, a Jitterbug is a dance. To others, for instance to welders, it is a tool that is used to chip away flux from a weld before capping the weld with another pass: to a concrete person it is a vibrating torpedo looking device that you drop into newly poured forms to vibrate all the air bubbles out to eliminate voids in the concrete.
If you build a site about "jitterbug" and do not use a description, you will get traffic looking for dance info instead of welders looking for tools. Good for a dance site, bad for a welding supply.
For local sites, the on page is critical. You are essentially telling Google to choose an excerpt off the page to display in the SERPS. instead of telling you potential visitors what you want to tell them about your site.