LIL-251. Fix cover

apps/course/templates/course/lesson.html

@@ -27,10 +27,14 @@
       <div class="lesson__subtitle subtitle">{{ lesson.title }}</div>
       <div class="lesson__content">{{ lesson.short_description }}</div>
       <a class="lesson__video video" href="#">
-        <img class="video__pic" src="{% static 'img/video-1.jpg' %}">
-        <svg class="icon icon-play">
+        {% if lesson.cover %}
+        <img class="video__pic" src="{{ lesson.cover.image.url }}"/>
+        {% else %}
+        <img class="video__pic" src="{% static 'img/no_cover.png' %}"/>
+        {% endif %} 
+        {% comment %} <svg class="icon icon-play">
           <use xlink:href="{% static 'img/sprite.svg' %}#icon-play"></use>
-        </svg>
+        </svg> {% endcomment %}
       </a>
     </div>
   </div>