added comment to make clear that leaving the variable analytics outside of the feature flag block is intentional

lms/templates/widgets/segment-io.html

@@ -1,5 +1,6 @@
 <!-- begin Segment.io -->
 <script type="text/javascript">
+  // Leaving this line out of the feature flag block is intentional. Pulling the line outside of the if statement allows it to serve as its own dummy object.
   var analytics=analytics||[];analytics.load=function(e){var t=document.createElement("script");t.type="text/javascript",t.async=!0,t.src=("https:"===document.location.protocol?"https://":"http://")+"d2dq2ahtl5zl1z.cloudfront.net/analytics.js/v1/"+e+"/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(t,n);var r=function(e){return function(){analytics.push([e].concat(Array.prototype.slice.call(arguments,0)))}},i=["identify","track","trackLink","trackForm","trackClick","trackSubmit","pageview","ab","alias","ready"];for(var s=0;s<i.length;s++)analytics[i[s]]=r(i[s])};
 
 % if settings.MITX_FEATURES.get('SEGMENT_IO_LMS'):