fixed exercise view when no tests and no files exist

Author: marcelja

app/views/exercises/show.html.erb

@@ -28,8 +28,8 @@
 <dl class="dl-horizontal">
 
     <dt><em><%= 'Files' %>:</em> </dt>
+    <br>
     <% @files.each do |file| %>
-      <br>
       <dd>
         <dt><%= 'Content: '%></dt>
         <dd><div class="editor_readonly"><%= file.content %></div></dd>
@@ -47,8 +47,8 @@
 </dl>
 <dl class="dl-horizontal">
     <dt><em><%= 'Tests' %>:</em> </dt>
+    <br>
     <% @tests.each do |test| %>
-      <br>
       <dd>
         <dt><%= 'Content: '%></dt>
         <dd><div class="editor_readonly"><%= test.content %></div></dd>