Issue 4481 - Scripts should expect the language selector to be missing, e.g. on the blog

static/js/main.js

 "use strict";
 
 (function()
 {
   function escapeRegExp(string)
   {
     return string.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
   }
 
   function hasClass(element, className)
@@ skipping 30 matching lines @@
     if (typeof window.event !== "undefined"
         && typeof window.event.cancelBubble !== "undefined")
       window.event.cancelBubble = true;
     else
       event.stopPropagation();
   }
 
   function initLanguageSelection()
   {
     var language = document.getElementById("language");
+    if (!language)

[saroyanm, 2016/09/28 12:34:27]

Detail: I think it make sense to have a small comment that we don't have
language selector in the blogs.

+      return;
+
     var languageSelection = language.getElementsByTagName("ul")[0];
 
     document.documentElement.onclick = function()
     {
       removeClass(languageSelection, "visible");
     };
 
     language.onclick = function(event)
     {
       if (hasClass(languageSelection, "visible"))
@@ skipping 13 matching lines @@
         return;
 
       if (hasClass(element, "selected") || element.id == "hamburger")
       {
         if ("querySelector" in document)
         {
           event.preventDefault();
           toggleClass(document.querySelector("header nav > ul"), "visible");
         }
         return false;
-      }  
+      }
       element = element.parentElement;
     }
   }
 
   function initMenu()
   {
     if ("querySelector" in document)
       document.querySelector("header nav").onclick = navigationClick;
   }
 
@@ skipping 16 matching lines @@
     {
       var section = footerNavSections[i];
       initFooterSection(section);
     }
   }
 
   initLanguageSelection();
   initMenu();
   initFooter();
 })();