LIL-431. Fix deferred_start_at block in course template

apps/course/templates/course/course.html

@@ -78,7 +78,7 @@
           </div>
           {% else %}
           <div class="user__ava ava">
-            <img class="ava__pic" src="{% static 'img/user.jpg' %}">
+            <img class="ava__pic" src="{% static 'img/user_default.jpg' %}">
           </div>
           {% endif %}
           <div class="user__info">
@@ -99,14 +99,16 @@
             </div>
             <div class="meta__title">{{ course.duration | rupluralize:"день,дня,дней" }}</div>
           </div>
+          {% if course.deferred_start_at %}
           <div class="meta__item">
             <div class="meta__icon">
               <svg class="icon icon-date">
                 <use xlink:href="{% static 'img/sprite.svg' %}#icon-date"></use>
               </svg>
             </div>
-            <div class="meta__title">{{ course.created_at | date:"d F Yг." }}</div>
+            <div class="meta__title">{{ course.deferred_start_at | date:"d F Yг. H:i" }}</div>
           </div>
+          {% endif %}
           {% if course.price %}
           <div class="meta__item">
             <div class="meta__icon">
@@ -224,7 +226,7 @@
         </div>
         {% else %}
         <div class="author__ava ava">
-          <img class="ava__pic" src="{% static 'img/user.jpg' %}">
+          <img class="ava__pic" src="{% static 'img/user_default.jpg' %}">
         </div>
         {% endif %}
         <div class="author__wrap">
@@ -348,7 +350,7 @@
         </div>
         {% else %}
         <div class="user__ava ava">
-          <img class="ava__pic" src="{% static 'img/user.jpg' %}">
+          <img class="ava__pic" src="{% static 'img/user_default.jpg' %}">
         </div>
         {% endif %}
         <div class="user__info">
@@ -375,7 +377,7 @@
               <use xlink:href="{% static 'img/sprite.svg' %}#icon-date"></use>
             </svg>
           </div>
-          <div class="meta__title">{{ course.created_at | date:"d F Yг." }}</div>
+          <div class="meta__title">{{ course.deferred_start_at | date:"d F Yг. H:i" }}</div>
         </div>
         {% if course.price %}
         <div class="meta__item">
@@ -418,7 +420,7 @@
           {% if request.user.photo %}
             src="{{ request.user.photo.url }}"
             {% else %}
-            src="{% static 'img/user.jpg' %}"
+            src="{% static 'img/user_default.jpg' %}"
           {% endif %}
           >
         </div>

apps/course/templates/course/course_only_lessons.html

@@ -103,7 +103,7 @@
                 <use xlink:href="{% static 'img/sprite.svg' %}#icon-date"></use>
               </svg>
             </div>
-            <div class="meta__title">{{ course.created_at | date:"d F Yг." }}</div>
+            <div class="meta__title">{{ course.deferred_start_at | date:"d F Yг. H:i" }}</div>
           </div>
           <div class="meta__item">
             <div class="meta__icon">