Don't show View Markdown for logged-out users

tildes/tildes/templates/macros/comments.jinja2

@@ -198,7 +198,7 @@
         {% endif %}
 
         {# Don't show the "View Markdown" button (or dropdown) if the user can edit #}
-        {% if not request.has_permission("edit", comment) %}
+        {% if request.user and not request.has_permission("edit", comment) %}
         <li>
           <div class="dropdown dropdown-right">
             <button class="btn-post-action dropdown-toggle">

tildes/tildes/templates/topic.jinja2

@@ -184,6 +184,7 @@
     {# Only show "View Markdown" (and dropdown) when it's a text topic and the user is
        allowed to view the content, but can't edit it #}
     {% if topic.is_text_type
+        and request.user
         and request.has_permission("view_content", topic)
         and not request.has_permission("edit", topic) %}
       <li>