Conversation.updateLastMessage: fix indent, use of null message

FREEBIE

js/models/conversations.js

@@ -409,10 +409,10 @@
         var collection = new Whisper.MessageCollection();
         return collection.fetchConversation(this.id, 1).then(function() {
             var lastMessage = collection.at(0);
+            if (lastMessage) {
                 if (lastMessage.get('type') === 'verified-change') {
                     return;
                 }
-            if (lastMessage) {
                 this.set({
                    lastMessage : lastMessage.getNotificationText(),
                    timestamp   : lastMessage.get('sent_at')