Making CMS Tree Page View compatible to FormidablePro

Good morning eskapism and MarsApril,
in Formidable Pro there is an option to bulk create radio-buttons, selects and check-boxes. If CMS Tree Page View is in plugin folder, even not activated, there drops an error about get_current_screen() function on line 217.

I resolved it with adding these code snippet before $current_screen:

if ( !function_exists('get_current_screen') ) {
function get_current_screen() {
	global $current_screen;

	if ( ! isset( $current_screen ) )
	return null;

	return $current_screen;
}
}

So please add these lines in next release to make your great plugin compatible to Formidable Pro.

Thanks for your wonderful plugin!
Kind regards
J0hn

I think it would be helpful for many people to add something about orderby => menu_order to the install notes.

https://www.ads-software.com/extend/plugins/cms-tree-page-view/