fix: repr(EmptyDirectorySnapshot)

It was throwing:

    AttributeError: 'EmptyDirectorySnapshot' object has no attribute '_stat_info'.

Reported by an anonymous crontributor in the shadow :)

Author: BoboTiG

changelog.rst

@@ -9,6 +9,7 @@ Changelog
 202x-xx-xx • `full history <https://github.com/gorakhargosh/watchdog/compare/v6.0.0...HEAD>`__
 
 - Adjust ``Observer.schedule()`` ``path`` type annotation to reflect the ``pathlib.Path`` support. (`#1096 <https://github.com/gorakhargosh/watchdog/pull/1096>`__)
+- [utils] Fixed ``repr(EmptyDirectorySnapshot)``, before that it was throwing an ``AttributeError: 'EmptyDirectorySnapshot' object has no attribute '_stat_info'``.
 - Thanks to our beloved contributors: @BoboTiG, @tybug
 
 **Breaking Changes**

src/watchdog/utils/dirsnapshot.py

@@ -401,7 +401,7 @@ class EmptyDirectorySnapshot(DirectorySnapshot):
     """
 
     def __init__(self) -> None:
-        pass
+        self._stat_info: dict[bytes | str, os.stat_result] = {}
 
     @staticmethod
     def path(_: Any) -> None:

tests/test_snapshot_diff.py

@@ -210,6 +210,7 @@ def test_empty_snapshot(p):
     mkdir(p("b", "c"), parents=True)
     ref = DirectorySnapshot(p(""))
     empty = EmptyDirectorySnapshot()
+    assert repr(empty) == "{}"
 
     diff = DirectorySnapshotDiff(empty, ref)
     assert diff.files_created == [p("a")]