Handle the case where no socket.io ack exists

src/channel/poll.js

@@ -2,6 +2,7 @@ var ChannelModule = require("./module");
 var Poll = require("../poll").Poll;
 import { ValidationError } from '../errors';
 import Config from '../config';
+import { ackOrErrorMsg } from '../util/ack';
 
 const TYPE_NEW_POLL = {
     title: "string",
@@ -160,6 +161,8 @@ PollModule.prototype.handleNewPoll = function (user, data, ack) {
         return;
     }
 
+    ack = ackOrErrorMsg(ack, user);
+
     if (typeof data !== 'object' || data === null) {
         ack({
             error: {

src/util/ack.js

@@ -0,0 +1,11 @@
+export function ackOrErrorMsg(ack, user) {
+    if (typeof ack === 'function') {
+        return ack;
+    }
+
+    return (result) => {
+        if (result.error) {
+            user.socket.emit('errorMsg', { msg: result.error.message });
+        }
+    };
+}