PLT-4205 Fixed pending posts always being considered as part of a post thread (#4488)

webapp/components/post_view/components/post_list.jsx

@@ -272,6 +272,7 @@ export default class PostList extends React.Component {
                 commentRootId = post.id;
             }
 
+            if (commentRootId) {
                 for (const postId in posts) {
                     if (posts[postId].root_id === commentRootId) {
                         commentCount += 1;
@@ -280,6 +281,7 @@ export default class PostList extends React.Component {
                         }
                     }
                 }
+            }
 
             if (parentPost && commentRootId) {
                 const commentsNotifyLevel = this.props.currentUser.notify_props.comments || 'never';