handle missing waypoints

def idle_task(self):
        '''handle missing waypoints'''
        if self.wp_period.trigger():
            # cope with packet loss fetching mission
            if self.master is not None and self.master.time_since('MISSION_ITEM') >= 2 and self.wploader.count() < getattr(self.wploader,'expected_count',0):
                wps = self.missing_wps_to_request();
                print("re-requesting WPs %s" % str(wps))
                self.send_wp_requests(wps)
        if self.module('console') is not None and not self.menu_added_console:
            self.menu_added_console = True
            self.module('console').add_menu(self.menu)
        if self.module('map') is not None and not self.menu_added_map:
            self.menu_added_map = True
            self.module('map').add_menu(self.menu)