From 010f0a84424fc3da47087eb1543bd8fc2f48c89a Mon Sep 17 00:00:00 2001
From: wangxu <1318272526@qq.com>
Date: Thu, 13 Nov 2025 17:48:15 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E5=BB=B6=E8=AF=AF=E6=95=B0?=
 =?UTF-8?q?=E6=8D=AE=E6=9F=A5=E8=AF=A2bug?=
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---
 app/eva_common.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/app/eva_common.py b/app/eva_common.py
index f05f45b..9d658c7 100644
--- a/app/eva_common.py
+++ b/app/eva_common.py
@@ -638,6 +638,8 @@ def gen_flow_turn_rate_index(avg_cross_delay_info, roads_dir_dict):
 
 
 def calc_service_level(delay_time):
+    if delay_time == '-' or delay_time == '':
+        return '-'
     if delay_time <= 10:
         service_level = 'A'
     elif 10 < delay_time <= 20: