suppress noise from early initialization during unit tests

the tests still all passed, but the missing browser globals in the node environment could cause misleading messages in the mocha output

js/legacy.js

@@ -246,6 +246,11 @@
          */
         me.init = function()
         {
+            // prevent early init
+            if (typeof document === 'undefined' || typeof navigator === 'undefined' || typeof window === 'undefined') {
+                return;
+            }
+
             // prevent bots from viewing a document and potentially deleting data
             // when burn-after-reading is set
             if (isBadBot()) {