Don't load analytics.js when not needed

front/src/main.html

@@ -63,7 +63,7 @@
     <!-- endbuild -->
 
     <script>
-        (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)})(window,document,'script','//www.google-analytics.com/analytics.js','ga');if('@@googleAnalyticsId'.indexOf('UA-')===0){ga('create','@@googleAnalyticsId','auto');}
+        if('@@googleAnalyticsId'.indexOf('UA-')===0){(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');ga('create','@@googleAnalyticsId','auto');}
     </script>
 </body>
 </html>