<div id="summary-view">
<div class="summary-cover-area">
<p><img id="summary-cover" class="book-cover"
- src="{% url cover_preview chunk.book.slug chunk.slug chunk.revision %}"></p>
+ {% if revision %}
+ src="{% url 'cover_preview' chunk.book.slug chunk.slug revision %}"
+ {% else %}
+ src="{% url 'cover_preview' chunk.book.slug chunk.slug %}"
+ {% endif %}></p>
<p><button id="summary-cover-refresh">{% trans "Refresh from working copy" %}</button></p>
</div>