minor bug fixes to pending posts

web/react/components/create_post.jsx

@@ -76,7 +76,7 @@ module.exports = React.createClass({
             var channel = ChannelStore.get(this.state.channelId);
 
             PostStore.storePendingPost(post);
-            PostStore.storeDraft(channel.id, userId, null);
+            PostStore.storeDraft(channel.id, null);
             this.setState({messageText: '', submitting: false, postError: null, previews: [], serverError: null});
 
             client.createPost(post, channel,

web/react/components/post_right.jsx

@@ -147,6 +147,7 @@ CommentPost = React.createClass({
             function(data) {
                 AsyncClient.getPosts(true);
 
+                var channel = ChannelStore.get(post.channel_id);
                 var member = ChannelStore.getMember(post.channel_id);
                 member.msg_count = channel.total_msg_count;
                 member.last_viewed_at = (new Date).getTime();