Use a with block rather than set to avoid leaking variables

templates/wish/table.html

@@ -19,7 +19,7 @@
     </thead>
     <tbody>
       {% for item in table_collection %}
-      {% set retirement_date = retired.get(item.fields.set) %}
+        {% with retirement_date = retired.get(item.fields.set) %}
           <tr>
             {{ table.image(item.url_for_image(), caption=item.fields.name, alt=item.fields.set) }}
             <td>{{ item.fields.set }} {{ table.rebrickable(item) }}</td>
@@ -36,6 +36,7 @@
             </td>
             {% endif %}
           </tr>
+        {% endwith %}
       {% endfor %}
     </tbody>
   </table>