When a browser window is closed, any WuQDialogNonModal instances must be...

When a browser window is closed, any WuQDialogNonModal instances must be reparented.  A step that was missing was updating these WuQDialogNonModal instances so that they no longer reference a closed window and this step has been added.  This fixes a crash caused by the Custom View Dialog trying to access a browser window that had been closed.