Fix user avatar in header

project/templates/blocks/header.html

@@ -63,7 +63,7 @@
           {% thumbnail request.user.photo "48x48" crop="center" as im %}
           <img class="ava__pic" src="{{ im.url }}" width="{{ im.width }}" height="{{ im.height }}" />
           {% empty %}
-          <img class="ava__pic" src="{% static 'img/user_default.png' %}" width="48px" height="48px" />
+          <img class="ava__pic" src="{% static 'img/user_default.jpg' %}" width="48px" height="48px" />
           {% endthumbnail %}
         </div>
         <div class="header__drop">