return early when retrieving DOM parents

Author: 43081j

javascript/atoms/dom.js

@@ -1251,19 +1251,22 @@ bot.dom.getOpacityNonIE_ = function(elem) {
  */
 bot.dom.getParentNodeInComposedDom = function(node) {
   var /**@type {Node}*/ parent = node.parentNode;
+
   // Shadow DOM v1
   if (parent.shadowRoot && node.assignedSlot !== undefined) {
     // Can be null on purpose, meaning it has no parent as
     // it hasn't yet been slotted
-    parent = node.assignedSlot ? node.assignedSlot.parentNode : null;
+    return node.assignedSlot ? node.assignedSlot.parentNode : null;
   }
+
   // Shadow DOM V0 (deprecated)
   if (node.getDestinationInsertionPoints) {
     var destinations = node.getDestinationInsertionPoints();
     if (destinations.length > 0) {
-      parent = destinations[destinations.length - 1];
+      return destinations[destinations.length - 1];
     }
   }
+
   return parent;
 };