don't fetch sidebar for multireddit urls

inc/processSubredditSidebar.js

@@ -2,6 +2,7 @@ module.exports = function() {
   this.processSubredditSidebar = (subreddit, redis, fetch, RedditAPI) => {
     return new Promise(resolve => {
       (async () => {
+        if(subreddit && !subreddit.includes('+')) {
           let key = `${subreddit}:sidebar`
           redis.get(key, (error, json) => {
             if(error) {
@@ -58,6 +59,9 @@ module.exports = function() {
               })
             }
           })
+        } else {
+          resolve(null)
+        }
       })()
     })
   }