From d58529f4cce0f6fbf9aeda0b1796df17a2f5c0f1 Mon Sep 17 00:00:00 2001
From: relikd <info@relikd.de>
Date: Mon, 24 Oct 2022 21:34:27 +0200
Subject: [PATCH] fix: most_used_key with empty list

---
 lektor_groupby/util.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lektor_groupby/util.py b/lektor_groupby/util.py
index 2689ea7..1bdb5c5 100644
--- a/lektor_groupby/util.py
+++ b/lektor_groupby/util.py
@@ -16,7 +16,7 @@ def report_config_error(key: str, field: str, val: str, e: Exception) -> None:
 def most_used_key(keys: List[str]) -> str:
     ''' Find string with most occurrences. '''
     if len(keys) < 3:
-        return keys[0]  # TODO: first vs last occurrence
+        return keys[0] if keys else ''  # TODO: first vs last occurrence
     best_count = 0
     best_key = ''
     tmp = {}  # type: Dict[str, int]