From cdd085eabc6e5ab2f654b7bda4ef0e688f2953c2 Mon Sep 17 00:00:00 2001
From: Sven Augustin <sven.augustin@psi.ch>
Date: Tue, 30 Jun 2020 21:10:40 +0200
Subject: [PATCH] added check on empty sequence to maxlen()

---
 slic/utils/printing.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/slic/utils/printing.py b/slic/utils/printing.py
index 629042155..0159a2251 100644
--- a/slic/utils/printing.py
+++ b/slic/utils/printing.py
@@ -16,6 +16,8 @@ def printable_dict(d, header=None):
 
 
 def maxlen(seq):
+    if not seq: # max of empty sequence is a ValueError
+        return 0
     return max(len(i) for i in seq)