NODE: resurrect 'ssh' window

Signed-off-by: Jeff Carr <jcarr@wit.com>

demo-window.go

@@ -7,6 +7,9 @@ import _ "github.com/andlabs/ui/winmanifest"
 var mybox *ui.Box
 
 func (n *Node) AddGroup(title string) *Node {
+	if (n == nil) {
+		return nil
+	}
 	hbox := n.uiBox
 	if (hbox == nil) {
 		return n

entry.go

@@ -42,11 +42,11 @@ func (b *GuiBox) GetText(name string) string {
 
 func (n *Node) SetText(value string) error {
 	log.Println("gui.SetText() value =", value)
-	if (n.uiText == nil) {
+	if (n.uiText != nil) {
 		n.uiText.SetText(value)
 		return nil
 	}
-	if (n.uiButton == nil) {
+	if (n.uiButton != nil) {
 		n.uiButton.SetText(value)
 		return nil
 	}

new-structs.go

@@ -235,7 +235,8 @@ func (n *Node) AddTab(title string, uiC *ui.Box) *Node {
 	log.Println("gui.Node.AddTab() START name =", title)
 	if parent.uiWindow == nil {
 		parent.Dump()
-		panic("gui.AddTab() ERROR ui.Window == nil")
+		log.Println("gui.Node.AddTab() ERROR ui.Window == nil")
+		return nil
 	}
 	if parent.box == nil {
 		parent.Dump()

window.go

@@ -184,23 +184,26 @@ func NewWindow() *Node {
 	w     := Config.Width
 	h     := Config.Height
 
-	var node *Node
-	node = mapWindow(nil, nil, title, w, h)
-	box := node.box
+	var n *Node
+	n = mapWindow(nil, nil, title, w, h)
+	box := n.box
 	log.Println("gui.NewWindow() title = box.Name =", box.Name)
 
-	node.uiNewWindow(box.Name, w, h)
-	window := node.uiWindow
+	n.uiNewWindow(box.Name, w, h)
+	window := n.uiWindow
 
 	f := Config.Exit
 	ui.OnShouldQuit(func() bool {
-		log.Println("createWindow().Destroy() on node.Name =", node.Name)
+		log.Println("createWindow().Destroy() on node.Name =", n.Name)
 		if (f != nil) {
-			f(node)
+			f(n)
 		}
 		return true
 	})
 
 	box.Window.UiWindow = window
-	return node
+	if(n.uiWindow == nil) {
+		panic("node.uiWindow == nil. This should never happen")
+	}
+	return n
 }