fix 查询瑕疵时，如果瑕疵不存在，直接返回null

@@ -1847,6 +1847,10 @@ public class BuyerOrderServiceImpl implements IBuyerOrderService {
 
 		Long orderCode = Long.valueOf(buyerOrder.getOrderCode());
 		QualityCheck qualityCheck = qualityCheckMapper.selectByOrderCode(Long.valueOf(buyerOrder.getOrderCode()));
+		//如果不存在，直接返回
+		if(qualityCheck==null){
+			return null;
+		}
 		QualityCheckResp resp = new QualityCheckResp();
 		resp.setOrderCode(orderCode);
 		resp.setCheckText(qualityCheck.getCheckText());