initial port of the UI kit

go/vdom/vnode.go

@@ -49,7 +49,11 @@ func El(tag string, mods ...Mod) *VNode {
 // Text builds a text VNode.
 func Text(s string) *VNode { return &VNode{Text: s} }
 
-func (n *VNode) apply(parent *VNode) { parent.Children = append(parent.Children, n) }
+func (n *VNode) apply(parent *VNode) {
+	if n != nil { // a nil child renders nothing (e.g. a closed Modal/Menu returns nil)
+		parent.Children = append(parent.Children, n)
+	}
+}
 
 type attrMod struct{ k, v string }