Fix issue in cache cleanup

Author: mikeshardmind

src/async_utils/__init__.py

@@ -9,7 +9,7 @@
 __author__ = "Michael Hall"
 __license__ = "Apache-2.0"
 __copyright__ = "Copyright 2020-Present Michael Hall"
-__version__ = "2025.03.08b"
+__version__ = "2025.03.12b"
 
 import os
 import sys

src/async_utils/lru.py

@@ -182,7 +182,7 @@ def _remove_some_expired(self) -> None:
         now = time.monotonic()
         tr = max((len(self._expirations) - self._maxsize) >> self._smooth, 2)
 
-        while tr > 0:
+        while self._expirations and tr > 0:
             ts, k = heapq.heappop(self._expirations)
             if ts < now:
                 tr -= 1