[patch] inteng-23549: add null checks for parentNode

Author: bredmond5

src/2_session.js

@@ -29,7 +29,6 @@ session.get = function(storage, first) {
  * @param {boolean=} first
  */
 session.set = function(storage, data, first) {
-
 	if (first && data['referring_link'] && utils.userPreferences.enableExtendedJourneysAssist) {
 		var now = new Date();
 		data['referringLinkExpiry'] = now.getTime() + utils.extendedJourneysAssistExpiryTime;

src/3_banner_utils.js

@@ -57,7 +57,7 @@ banner_utils.error_timeout = 2000;
  * @param {Object} element
  */
 banner_utils.removeElement = function(element) {
-	if (element) {
+	if (element && element.parentNode) {
 		element.parentNode.removeChild(element);
 	}
 };

src/branch_view.js

@@ -141,9 +141,9 @@ branch_view.displayJourney = function(html, requestData, templateId, branchViewD
 	var audienceRuleId = branchViewData['audience_rule_id'];
 
 	// this code removes any leftover css from previous banner
-	var branchCSS = document.getElementById('branch-iframe-css')
-	if (branchCSS) {
-		branchCSS.parentElement.removeChild(branchCSS)
+	var branchCSS = document.getElementById('branch-iframe-css');
+	if (branchCSS && branchCSS.parentElement) {
+		branchCSS.parentElement.removeChild(branchCSS);
 	}
 
 	var placeholder = document.createElement('div');