analytics only on production

_layouts/default.html

@@ -146,7 +146,7 @@
     <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-throttle-debounce/1.1/jquery.ba-throttle-debounce.min.js"
             crossorigin="anonymous" integrity="sha256-+nuEu243+6BveXk5N+Vbr268G+4FHjUOEcfKaBqfPbc= sha384-ugp/e34LtoER7mwf3SLygR0OL+STa4FTLzk7MRbpY/usE4VV+24hBxRXRS6g5ZJy sha512-JZSo0h5TONFYmyLMqp8k4oPhuo6yNk9mHM+FY50aBjpypfofqtEWsAgRDQm94ImLCzSaHeqNvYuD9382CEn2zw=="></script>
     <script src="{{site.baseurl}}/lib/fluidbox/js/jquery.fluidbox.min.js"></script>
-
+    {% if jekyll.environment == "production" %}
     <script>
         (function (i, s, o, g, r, a, m) {
             i['GoogleAnalyticsObject'] = r; i[r] = i[r] || function () {
@@ -165,7 +165,15 @@
                 eventAction: action
             });
         }
-
+    </script>
+    {% else %}
+    <script>
+        function gaEvent(action) {
+            // do nothing
+        }
+    </script>
+    {% endif %}
+    <script>
         $(function () {
             var lightboxOpen = false,
                 lightboxSelector = 'a[rel="lightbox"]';