Hiode candidate question area when there is no question

fixes #181

src/strass/strass_app/templates/strass_app/candidate_detail.html

@@ -152,6 +152,7 @@
         </div>
     </div>
     {%endif%}
+    {%if object.candidateanswer_set.exists %}
     <div class="card">
         <div class="card-header">{%trans "Candidate Questions"%}</div>
         <div class="card-body">
@@ -160,6 +161,7 @@
             {%endfor%}
         </div>
     </div>
+    {%endif%}
 </div>
 {% if request|can_read_recommendations_of_candidate:object %}
 <div class="col-12 col-xl-6">