From e5164113c478b461eaf035bf62c3beea33e426a7 Mon Sep 17 00:00:00 2001
From: "jeremy@jermolene.com" <jeremy@jermolene.com>
Date: Thu, 5 May 2022 14:47:22 +0100
Subject: [PATCH] Don't create variables with value undefined for missing
 parameters

---
 core/modules/widgets/parameters.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/modules/widgets/parameters.js b/core/modules/widgets/parameters.js
index 0b49d4bf7..d741ffe2c 100644
--- a/core/modules/widgets/parameters.js
+++ b/core/modules/widgets/parameters.js
@@ -51,7 +51,7 @@ ParametersWidget.prototype.execute = function() {
 	if(transclusionWidget) {
 		$tw.utils.each($tw.utils.getOrderedAttributesFromParseTreeNode(self.parseTreeNode),function(attr,index) {
 			var name = attr.name,
-				value = transclusionWidget.getTransclusionParameter(name,index,self.getAttribute(name));
+				value = transclusionWidget.getTransclusionParameter(name,index,self.getAttribute(name,""));
 			self.setVariable(name,value);
 		});
 		$tw.utils.each(transclusionWidget.getTransclusionMetaVariables(),function(value,name) {