Fix passing a filtered attribute as a MVV (#9663)

core/modules/widgets/transclude.js

@@ -25,7 +25,7 @@ Render this widget into the DOM
 */
 TranscludeWidget.prototype.render = function(parent,nextSibling) {
 	this.parentDomNode = parent;
-	this.computeAttributes();
+	this.computeAttributes({asList: true});
 	this.execute();
 	try {
 		this.renderChildren(parent,nextSibling);

core/modules/widgets/widget.js

@@ -377,6 +377,7 @@ Widget.prototype.makeFakeWidgetWithVariables = function(variables) {
 Compute the current values of the attributes of the widget. Returns a hashmap of the names of the attributes that have changed.
 Options include:
 filterFn: only include attributes where filterFn(name) returns true
+asList: boolean if true returns results as an array instead of a single value
 */
 Widget.prototype.computeAttributes = function(options) {
 	options = options || {};
@@ -389,7 +390,7 @@ Widget.prototype.computeAttributes = function(options) {
 				return;
 			}
 		}
-		var value = self.computeAttribute(attribute),
+		var value = self.computeAttribute(attribute,options),
 			multiValue = null;
 		if($tw.utils.isArray(value)) {
 			multiValue = value;