Return an empty string from natural_list for an empty list (#318)

Signed-off-by: Charlie Tonneslan <cst0520@gmail.com>

Author: Charlie Tonneslan

src/humanize/lists.py

@@ -28,6 +28,8 @@ def natural_list(items: list[Any]) -> str:
     Returns:
         str: A string with commas and 'and' in the right places.
     """
+    if not items:
+        return ""
     if len(items) == 1:
         return str(items[0])
     elif len(items) == 2:

tests/test_lists.py

@@ -12,6 +12,7 @@
         ([["one", "two", "three"]], "one, two and three"),
         ([["one", "two"]], "one and two"),
         ([["one"]], "one"),
+        ([[]], ""),
         ([[""]], ""),
         ([[1, 2, 3]], "1, 2 and 3"),
         ([[1, "two"]], "1 and two"),