FIX: Stop loading more if initial topic list less than limit

In cases where the initial topic list is less than 30 and the viewport
is short enough to scroll, an additional set of topics would load. This
commit prevents a load more link from being generated in those
instances.

lib/knowledge_explorer/query.rb

@@ -61,6 +61,7 @@ module KnowledgeExplorer
       else
         offset = 0
         page_range = @limit
+        end_of_list = true if results_length < @limit
       end
 
       results = results[offset...page_range]