无当前日期价格时，往前找价格。

application/third_party/ctmobilefirst/models/api_model.php

@@ -70,6 +70,7 @@ class Api_model extends CI_Model {
                      where (BIZ_PackageInfo.PAG_Code = ? ) AND (pag_dei_sn= ? ) 
                     and ? between PKP_PersonStart and PKP_PersonStop 
                     order by pkp_invaliddate desc,PKP_PriceGrade   ";
+                    $query = $this->HT->query($sql, $param);
                     if ($query->num_rows() > 0) {
                         return $query->row();
                     }else {