Fix for list widget with an empty paragraph as inline template

Fixes #7902

core/modules/widgets/list.js

@@ -109,6 +109,7 @@ ListWidget.prototype.findExplicitTemplates = function() {
 	this.explicitJoinTemplate = null;
 	this.hasTemplateInBody = false;
 	var searchChildren = function(childNodes) {
+		var foundInlineTemplate = false;
 		$tw.utils.each(childNodes,function(node) {
 			if(node.type === "list-template") {
 				self.explicitListTemplate = node.children;
@@ -118,12 +119,14 @@ ListWidget.prototype.findExplicitTemplates = function() {
 				self.explicitJoinTemplate = node.children;
 			} else if(node.type === "element" && node.tag === "p") {
 				searchChildren(node.children);
+				foundInlineTemplate = true;
 			} else {
-				self.hasTemplateInBody = true;
+				foundInlineTemplate = true;
 			}
 		});
+		return foundInlineTemplate;
 	};
-	searchChildren(this.parseTreeNode.children);
+	this.hasTemplateInBody = searchChildren(this.parseTreeNode.children);
 }
 
 ListWidget.prototype.getTiddlerList = function() {

core/templates/html-json-skinny-tiddler.tid

@@ -1,3 +1,3 @@
 title: $:/core/templates/html-json-skinny-tiddler
 
-<$text text=<<join>>/><$jsontiddler tiddler=<<currentTiddler>> exclude="text" escapeUnsafeScriptChars="yes"/>
+<$jsontiddler tiddler=<<currentTiddler>> exclude="text" escapeUnsafeScriptChars="yes"/>

core/templates/store.area.template.html.tid

@@ -9,7 +9,9 @@ title: $:/core/templates/store.area.template.html
             <$let newline={{{ [charcode[10]] }}} join=`,$(newline)$`>
                 <$text text=<<newline>>/>
                 <$list filter=<<saveTiddlerFilter>> join=<<join>> template="$:/core/templates/html-json-tiddler"/>
-                <$list filter="[subfilter<skinnySaveTiddlerFilter>]"  template="$:/core/templates/html-json-skinny-tiddler"/>
+                <$vars numTiddlers={{{ [subfilter<saveTiddlerFilter>count[]] }}}>
+                    <$list filter={{{ [<skinnySaveTiddlerFilter>] }}} join=<<join>> template="$:/core/templates/html-json-skinny-tiddler"/>
+                </$vars>
                 <$text text=<<newline>>/>
             </$let>
         `]</script>`
@@ -20,8 +22,8 @@ title: $:/core/templates/store.area.template.html
         <!-- Old-style DIV/PRE-based store area -->
         <$reveal type="nomatch" state="$:/isEncrypted" text="yes">
             `<div id="storeArea" style="display:none;">`
-                <$list filter={{{ [<saveTiddlerFilter>] }}} template="$:/core/templates/html-div-tiddler"/>
-                <$list filter="[subfilter<skinnySaveTiddlerFilter>]" template="$:/core/templates/html-div-skinny-tiddler"/>
+                <$list filter=<<saveTiddlerFilter>> template="$:/core/templates/html-div-tiddler"/>
+                <$list filter={{{ [<skinnySaveTiddlerFilter>] }}} template="$:/core/templates/html-div-skinny-tiddler"/>
             `</div>`
         </$reveal>
     </$list>

editions/test/tiddlers/tests/data/list-widget/WithEmptyParagraphTemplate.tid

@@ -0,0 +1,13 @@
+title: ListWidget/WithEmptyParagraphTemplate
+description: List widget with an empty paragraph as inline template
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
++
+title: Output
+
+<$list filter="1"><p/></$list>
++
+title: ExpectedResult
+
+<p><p></p></p>

plugins/tiddlywiki/tiddlyweb/html-json-skinny-tiddler.tid

@@ -1,3 +1,3 @@
 title: $:/core/templates/html-json-skinny-tiddler
 
-<$text text=<<join>>/><$jsontiddler tiddler=<<currentTiddler>> exclude="text" escapeUnsafeScriptChars="yes" $revision=<<changecount>> $bag="default" $_is_skinny=""/>
+<$jsontiddler tiddler=<<currentTiddler>> exclude="text" escapeUnsafeScriptChars="yes" $revision=<<changecount>> $bag="default" $_is_skinny=""/>