update去空处理

update wf_task_info

  assignee=#{assignee},
  assignee_name=#{assigneeName},
  distribution_user=#{distributionUser},
  distribution_date=#{distributionDate},
  updated_by=#{updatedBy},
  updated_date=#{updatedDate},
  status=#{status},
  end_date=#{endDate},
  comment=#{comment},
 
where task_id = #{taskId}