_convert_aware_datetime: return early when value=None

Author: hugovk

src/humanize/time.py

@@ -301,6 +301,9 @@ def _convert_aware_datetime(
     value: dt.datetime | dt.timedelta | float | None,
 ) -> Any:
     """Convert aware datetime to naive datetime and pass through any other type."""
+    if value is None:
+        return None
+
     import datetime as dt
 
     if isinstance(value, dt.datetime) and value.tzinfo is not None: