Don't render Textblock when binding is an empty string or null

GoJS
1

The large font is a binded “title” and the green box is a binded “label”.

Sometimes the label is not set so I don’t want to render that green Textblock at all.

image

2 
{ visible: false },  // default is not visible
new go.Binding("visible", "theStringProp", s => !!s)
3

Perfect, thank you!