From 5fa136289be675934037691817742335ee53a275 Mon Sep 17 00:00:00 2001
From: David Brophy <dave@brophy.uk>
Date: Mon, 4 Jul 2016 17:43:26 +0200
Subject: [PATCH] Added vecty.Nil, prevent replaceNode if new node is nil

---
 dom.go     | 19 +++++++++++++++++++
 domutil.go |  3 +++
 2 files changed, 22 insertions(+)

diff --git a/dom.go b/dom.go
index 838265da..f8a75601 100644
--- a/dom.go
+++ b/dom.go
@@ -247,3 +247,22 @@ func (c *Composite) ReconcileBody() {
 		replaceNode(c.Body.Node(), oldBody.Node())
 	}
 }
+
+type nilComponent struct {
+	node *js.Object
+}
+
+// Apply implements the Markup interface.
+func (s *nilComponent) Apply(element *Element) {}
+
+func (s *nilComponent) Reconcile(oldComp Component) {}
+
+func (s *nilComponent) Node() *js.Object {
+	return nil
+}
+
+func (e *nilComponent) Unmount() {}
+
+func Nil() Component {
+	return &nilComponent{}
+}
diff --git a/domutil.go b/domutil.go
index 78c7d85b..d08dcb6e 100644
--- a/domutil.go
+++ b/domutil.go
@@ -10,5 +10,8 @@ func replaceNode(newNode, oldNode *js.Object) {
 	if newNode == oldNode {
 		return
 	}
+	if newNode == nil {
+		return
+	}
 	oldNode.Get("parentNode").Call("replaceChild", newNode, oldNode)
 }