"answered by xyz" should not be shown on the user page

app/views/shared/_answerbox.html.haml

@@ -9,11 +9,12 @@
         %p.answerbox-question-text= a.question.content
   .panel-body
     %p= a.content
+    - if @user.nil?
       %p.text-muted
         Answered by
         %a{href: show_user_profile_path(a.user.screen_name)}
           %img.img-rounded.img-answerbox-small{src: gravatar_url(a.user)}
           %span= a.user.screen_name
     - if privileged? a.user
-      %button.btn.btn-danger{name: 'ab-destroy', 'data-a-id' => a.id}
+      %button.btn.btn-sm.btn-danger{name: 'ab-destroy', 'data-a-id' => a.id}
         Delete