修复：新人券查询时错误 导致非新人券也被赠送了

app/common/dao/store/coupon/StoreCouponDao.php

@@ -85,7 +85,7 @@ class StoreCouponDao extends BaseDao
     {
         $query = StoreCoupon::getDB()
             ->where('status', 1)
-            ->when(isset($where['send_type']) && $where['send_type'] !== '', function ($query) use ($send_type) {
+            ->when(!is_null($send_type), function ($query) use ($send_type) {
                 $query->where('send_type', $send_type);
             })
             ->where('is_del', 0)