fix bug w/ blog posts added by previous teaching bugfix

Author: staeiou

_includes/archive-single.html

@@ -40,9 +40,9 @@ <h2 class="archive__item-title" itemprop="headline">
 
         {% if post.collection == 'teaching' %}
           <p> {{ post.type }}, <i>{{ post.venue }}</i>, {{ post.date | default: "1900-01-01" | date: "%Y" }} </p>
-        {% elsif page.venue and page.date %}
+        {% elsif post.venue and post.date %}
           <p>Published in <i>{{ post.venue }}</i>, {{ post.date | default: "1900-01-01" | date: "%Y" }} </p>
-        {% elsif page.date %}
+        {% elsif post.date %}
          <p class="page__date"><strong><i class="fa fa-fw fa-calendar" aria-hidden="true"></i> {{ site.data.ui-text[site.locale].date_label | default: "Published:" }}</strong> <time datetime="{{ post.date | default: "1900-01-01" | date_to_xmlschema }}">{{ post.date | default: "1900-01-01" | date: "%B %d, %Y" }}</time></p>
         {% endif %}