Merge pull request #2435 from 18F/ms-fix_analytics

Only keep analytics on production

_includes/google_analytics.html

@@ -1,18 +1,21 @@
 <!-- Digital Analytics Program roll-up, see the data at https://analytics.usa.gov -->
 <script src="https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js" id="_fed_an_ua_tag"></script>
-
+
+{% assign ga_id = site.google_analytics[site.branch]|default:site.google_analytics.default %}
+{% if ga_id %}
 <script>
   // Google Analytics
   (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', '{{ include.id }}', 'auto');
+  ga('create', '{{ ga_id }}', 'auto');
   ga('set', 'anonymizeIp', true);
   ga('set', 'forceSSL', true);
   ga('send', 'pageview');
 </script>
+{% endif %}
 
 <!-- Google Tag Manager -->
 <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':