previous page link fix

_layouts/post.html

@@ -31,12 +31,12 @@ pagestyle: posts
 {% endfor %}
 
 <section class="page-links">
-{% if page.next.url %}
+{% if page.previous %}
 <a class="page-prev" href="{{ site.base-url }}{{ page.previous.url }}" title="{{ page.previous.title }}">
 	{{ page.previous.title }}
 </a>
 {% endif %}
-{% if page.next.url %}
+{% if page.next %}
 <a class="page-next" href="{{ site.base-url }}{{ page.next.url }}" title="{{ page.next.title }}">
 	{{ page.next.title }}
 </a>