Also return data_not_found when schedule is not None but empty.
Also return data_not_found when schedule is not None but empty.

fanglinfang/myuw,uw-it-aca/myuw,uw-it-aca/myuw,fanglinfang/myuw,uw-it-aca/myuw,uw-it-aca/myuw,fanglinfang/myuw