Don't print a link if it's empty [closes #2]

comment_template.html

@@ -9,7 +9,7 @@ <h1>{{page.comment_count}} Comments</h1>
 	{% for c in page.comments %}
 		<div class="comment {% cycle 'odd', 'even' %}">
 			<p class="comment_header">
-				From: {% if c.link %}
+				From: {% if c.link and c.link != '' %}
 					<a href="{{c.link}}">{{c.name}}</a>
 				{% else %}
 					{{c.name}}