analysis.getUserPortrait只能获取到前天的数据，昨天及再之前的数据返回都是空？

返回： {“ref_date”:“20191124”,“visit_uv_new”:{“province”:[],“city”:[],“genders”:[],“platforms”:[],“devices”:[],“ages”:[]},“visit_uv”:{“province”:[],“city”:[],“genders”:[],“platforms”:[],“devices”:[],“ages”:[]}}

{“ref_date”:“20191118-20191124”,“visit_uv_new”:{“province”:[],“city”:[],“genders”:[],“platforms”:[],“devices”:[],“ages”:[]},“visit_uv”:{“province”:[],“city”:[],“genders”:[],“platforms”:[],“devices”:[],“ages”:[]}}