From 71d6f737bdfdb08355147c60c8efee4de53e2763 Mon Sep 17 00:00:00 2001
From: Sylvestre Ledru <sylvestre@debian.org>
Date: Mon, 7 Nov 2022 09:11:25 +0100
Subject: [PATCH] fail when no arg provided

---
 graph.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/graph.py b/graph.py
index ee3f1ecf4..71e01e1d8 100644
--- a/graph.py
+++ b/graph.py
@@ -7,6 +7,10 @@ import time
 import matplotlib.pyplot as plt
 import pandas as pd
 
+if len(sys.argv) <= 1:
+   print('graph.py: Need an arg')
+   sys.exit()
+
 d = pd.read_json(sys.argv[1], orient="index")
 df = pd.DataFrame(d)