Bugfix: show users in sidebar (#217)

Author: volker-fr

slackviewer/templates/viewer.html

@@ -35,7 +35,7 @@ <h3 id="group-title">Private Channels</h3>
             {% endfor %}
         </ul>
         {% endif %}
-        {% if dms %}
+        {% if dm_users %}
         <h3 id="dm-title">Direct Messages</h3>
         <ul class="list" id="dms-list">
             {% for dm in dm_users %}
@@ -48,7 +48,7 @@ <h3 id="dm-title">Direct Messages</h3>
             {% endfor %}
         </ul>
         {% endif %}
-        {% if mpims %}
+        {% if mpim_users %}
         <h3 id="mpim-title">Group Direct Messages</h3>
         <ul class="list" id="mpims-list">
             {% for mpim in mpim_users %}