Resolve "Include header box from SchoolApps"

Closes #61 (closed)

aleksis/apps/chronos/templates/chronos/partials/headerbox.html

 {% load i18n %}
 
-{% if affected_teachers and affected_groups %}
+{% if affected_teachers or affected_groups or absent_teachers or absent_groups %}
   <div class="{% if not print %}card{% endif %}">
     <div class="{% if not print %}card-content{% endif %}">
+      {% if absent_teachers %}
+        <div class="row no-margin">
+          <div class="col s12 m3">
+            <strong class="truncate">
+              {% trans "Absent teachers" %}
+            </strong>
+          </div>
+          <div class="col s12 m9 black-text-a">
+            {% include "chronos/partials/teachers.html" with teachers=absent_teachers %}
+          </div>
+        </div>
+      {% endif %}
+      {% if absent_groups %}
+        <div class="row no-margin">
+          <div class="col s12 m3">
+            <strong class="truncate">
+              {% trans "Absent groups" %}
+            </strong>
+          </div>
+          <div class="col s12 m9 black-text-a">
+            {% include "chronos/partials/groups.html" with groups=absent_groups %}
+          </div>
+        </div>
+      {% endif %}
       {% if affected_teachers %}
         <div class="row no-margin">
           <div class="col s12 m3">