show closed group in channels list

ts/components/session/LeftPaneChannelSection.tsx

@@ -87,9 +87,7 @@ export class LeftPaneChannelSection extends React.Component<Props, State> {
       conversationList = conversationList.filter(
         // a channel is either a public group or a rss group
         conversation =>
-          conversation.type === 'group' &&
+        conversation && conversation.type === 'group'
-          (conversation.isPublic ||
-            (conversation.lastMessage && conversation.lastMessage.isRss))
       );
     }