Delete multiple nodes dialog must warn when no action is taken

The Delete Multiple Nodes dialog in the console has a checkbox for deleting child nodes also. If you select nodes that have childnodes, do NOT check the box and click OK, no action is taken by the dialog. This is a safety measure, which is good because it will make you aware that you are going to delete (maybe a lot of) child nodes as well.

But in this case, the dialog closes and nothing happens. Which leaves the user puzzled. This can be improved by either:

A. on OK add a warning to the dialog saying "You have selected nodes to delete that have child nodes. Please tick the checkbox to confirm they can be deleted."

or B. keep/make the OK button disabled when nodes with childnodes are selected, but the checkbox is not ticked.