Avatars should be displayed if the user has any

I guess that the bloggers view should only try to display the user's avatar when the user has one. For example here: http://www.4242.hu/hu/advanced_blog/list we have several users who have no avatar (like dentro or KalmárAttila), but instead of nothing, it has the img html tag:
<img src="/" alt="dentro" title="dentro" />
This causes a little "image is missing" icon displayed in several browsers (like chrome or internet explorer).