listing description served as meta description

[Petrache Nicolae]

how we can have the listing description served as meta description? becouse it is not.
<meta content="" name="description">
<meta content="" name="Keywords">

that apears when i view a listing instead of catching the listing description as it should?

if you look at page http://www.piese-laptop.ro/piese-lap...c840-3043.html

<title>Alimentator laptop Dell Latitude PA-9 Nou Dell Inspiron 2500, 4000, 8000, Latitude C610, C640, C810, C840</title> THIS IS FINE
<meta content="IE=9" http-equiv="X-UA-Compatible">
<meta content="Piese-laptop.ro" name="generator">
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<meta content="" name="description"> the listing description does not show and that is a SEO KILLER.
<meta content="" name="Keywords">