[toolbar-group] Fixed error when a child element is null

[janicduplessis]

Fixed an error when you try to show/hide and element inside a ToolbarGroup based on some conditions.

var ele = this.props.something ? <Element /> : null;
<ToolbarGroup>{ele}</ToolbarGroup>

I just added a null check in the map function
...and sublime deleted some trailing whitespace!

[hai-cea]

Thanks @janicduplessis !