modification du template suite a la modification du scope des variables jinja (ref https://stackoverflow.com/questions/9486393/jinja2-change-the-value-of-a-variable-inside-a-loop and https://github.com/pallets/jinja/issues/164)

theme/templates/archives.html

@@ -34,12 +34,12 @@ Full archives of {{ SITENAME|striptags|e }} blog.
 <div class="row-fluid">
     <div class="span10 offset2">
         <div class="blog-archives">
-            {% set last_year = 0 %}
+            {% set last_year = {'lastyear': 0} %}
             {% for article in dates %}
             {% set year = article.date.strftime('%Y') %}
-            {%if last_year != year %}
+            {%if last_year.lastyear != year %}
             <h2 id="{{year }}"><a href="#{{year}}">{{ year }}</a></h2>
-            {% set last_year = year %}
+            {% set _dummy = last_year.update({'lastyear': year}) %}
             {% endif %}
             {% set next_year = 0 %}
             {% if not loop.last %}