[3.13] pythongh-114713: Revert pythongh-114731 (pythonGH-133330) (python#133331)

pythongh-114713: Revert pythongh-114731 (pythonGH-133330)

Revert "pythongh-114713: Handle case of an empty string passed to `zoneinfo.ZoneInfo` (pythonGH-114731)"

This reverts commit 884df11.
(cherry picked from commit fe44fc4)

Co-authored-by: Kirill Podoprigora <[email protected]>

Author: miss-islington

Lib/test/test_zoneinfo/test_zoneinfo.py

@@ -235,7 +235,6 @@ def test_bad_keys_paths(self):
             "../zoneinfo/America/Los_Angeles",  # Traverses above TZPATH
             "America/../America/Los_Angeles",  # Not normalized
             "America/./Los_Angeles",
-            "",
         ]
 
         for bad_key in bad_keys:

Lib/zoneinfo/_tzpath.py

@@ -83,11 +83,6 @@ def find_tzfile(key):
 
 
 def _validate_tzfile_path(path, _base=_TEST_PATH):
-    if not path:
-        raise ValueError(
-            "ZoneInfo key must not be an empty string"
-        )
-
     if os.path.isabs(path):
         raise ValueError(
             f"ZoneInfo keys may not be absolute paths, got: {path}"