Add ability to deactivate GA snippet

lms/envs/common.py

@@ -445,7 +445,7 @@ if FEATURES.get('ENABLE_SQL_TRACKING_LOGS'):
     })
 
 ######################## GOOGLE ANALYTICS ###########################
-GOOGLE_ANALYTICS_ACCOUNT = 'GOOGLE_ANALYTICS_ACCOUNT_DUMMY'
+GOOGLE_ANALYTICS_ACCOUNT = None
 GOOGLE_ANALYTICS_LINKEDIN = 'GOOGLE_ANALYTICS_LINKEDIN_DUMMY'
 
 ######################## subdomain specific settings ###########################

lms/templates/google_analytics.html

-<script type="text/javascript">
-var _gaq = _gaq || [];
-_gaq.push(['_setAccount', '${settings.GOOGLE_ANALYTICS_ACCOUNT}']);
-_gaq.push(['_trackPageview']);
+% if settings.GOOGLE_ANALYTICS_ACCOUNT:
+    <script type="text/javascript">
+    var _gaq = _gaq || [];
+    _gaq.push(['_setAccount', '${settings.GOOGLE_ANALYTICS_ACCOUNT}']);
+    _gaq.push(['_trackPageview']);
 
-(function() {
-  var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
-  ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
-  var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
-})();
-</script>
+    (function() {
+      var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
+      ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
+      var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
+    })();
+    </script>
+% endif