tpl/urls: Return empty string when JoinPath has zero args

docs/content/en/functions/urls.JoinPath.md

@@ -1,6 +1,6 @@
 ---
 title: urls.JoinPath
-description: Joins the provided elements into a URL string and cleans the result of any ./ or ../ elements.
+description: Joins the provided elements into a URL string and cleans the result of any ./ or ../ elements. If the argument list is empty, JoinPath returns an empty string.
 categories: [functions]
 menu:
   docs:
@@ -10,6 +10,7 @@ signature: ["urls.JoinPath ELEMENT..."]
 ---
 
 ```go-html-template
+{{ urls.JoinPath }} → ""
 {{ urls.JoinPath "" }} → "/"
 {{ urls.JoinPath "a" }} → "a"
 {{ urls.JoinPath "a" "b" }} → "a/b"

tpl/urls/urls.go

@@ -187,16 +187,19 @@ func (ns *Namespace) AbsLangURL(s any) (template.HTML, error) {
 }
 
 // JoinPath joins the provided elements into a URL string and cleans the result
-// of any ./ or ../ elements.
+// of any ./ or ../ elements. If the argument list is empty, JoinPath returns
+// an empty string.
 func (ns *Namespace) JoinPath(elements ...any) (string, error) {
 
+	if len(elements) == 0 {
+		return "", nil
+	}
+
 	var selements []string
 	for _, e := range elements {
 		switch v := e.(type) {
 		case []string:
-			for _, e := range v {
-				selements = append(selements, e)
-			}
+			selements = append(selements, v...)
 		case []any:
 			for _, e := range v {
 				se, err := cast.ToStringE(e)