Send last file signal on close event

        :param event: The close event
        :type event:
        :returns: None
        :rtype: None
        :raises: None

def closeEvent(self, event):
        """Send last file signal on close event

        :param event: The close event
        :type event:
        :returns: None
        :rtype: None
        :raises: None
        """
        lf = self.browser.get_current_selection()
        if lf:
            self.last_file.emit(lf)
        return super(GenesisWin, self).close()