Correct comparison

post.hbs

@@ -152,15 +152,15 @@ the {{{body}}} of the default.hbs template, containing the blog header/footer. -
 <script type="text/javascript" src="{{asset "js/readingtime.js"}}"></script>
 <script type="text/javascript">
 
-  if(ga_ua != undefined){
+  /* Analytics */
+  if(typeof ga_ua != "undefined"){
     (function(g,h,o,s,t,z){g.GoogleAnalyticsObject=s;g[s]||(g[s]=
           function(){(g[s].q=g[s].q||[]).push(arguments)});g[s].s=+new Date;
       t=h.createElement(o);z=h.getElementsByTagName(o)[0];
       t.src='//www.google-analytics.com/analytics.js';
       z.parentNode.insertBefore(t,z)}(window,document,'script','ga'));
       ga('create',ga_ua);ga('send','pageview');
   }
-  /* Analytics */
 
   /* Disqus comment count */
   (function () {