temporarily disable trending and active if no such data is passed to template.

lms/templates/discussion/_recent_active_posts.html

@@ -2,8 +2,10 @@
   
   <div class="recent-activity-title">Recent Activity:</div>
 
-<div class="recent-active-posts">
+% if recent_active_threads:
+  <div class="recent-active-posts">
     % for thread in recent_active_threads:
       <a class="recent-active-post" href="javascript:void(0)">${thread['title']}</a>
     % endfor
-</div>
+  </div>
+% endif
\ No newline at end of file

lms/templates/discussion/_trending_tags.html

 <div class="trending-tags">
 Trending tags:
-
+  % if trending_tags:
     % for tag, count in trending_tags:
       <div class="trending-tag">
         <a class="trending-tag-link" href="javascript:void(0)">${tag}</a>
@@ -8,4 +8,5 @@ Trending tags:
         <span class="trending-tag-count">${count}</span>
       </div>
     % endfor
+  % endif
 </div>