From 557a4d5dd0e3e6745744ddd07dabc8e08d19f78e Mon Sep 17 00:00:00 2001
From: Johannes Hentschel <johannes.hentschel@epfl.ch>
Date: Fri, 24 Nov 2023 02:40:11 +0100
Subject: [PATCH] catches a tiny bug

---
 src/ms3/utils/functions.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ms3/utils/functions.py b/src/ms3/utils/functions.py
index fb23dbce..e5896664 100644
--- a/src/ms3/utils/functions.py
+++ b/src/ms3/utils/functions.py
@@ -889,8 +889,10 @@ def dataframe2markdown(
     return writer
 
 
-def dict2oneliner(d):
+def dict2oneliner(d: dict) -> str:
     """Turns a dictionary into a single-line string without brackets."""
+    if pd.isnull(d) or isinstance(d, str):
+        return d
     return ", ".join(f"{k}: {v}" for k, v in d.items())