L2SS-1914: Fix extract entry point

lofar_stingray/extract.py

-#  Copyright (C) 2024 ASTRON (Netherlands Institute for Radio Astronomy)
+#  Copyright (C) 2025 ASTRON (Netherlands Institute for Radio Astronomy)
 #  SPDX-License-Identifier: Apache-2.0
 
 """Entry point to extract statistic matrices & metadata to store them as HDF5"""
@@ -6,6 +6,7 @@
 import argparse
 import logging
 import os
+import sys
 import tempfile
 from datetime import datetime, timedelta
 from urllib.parse import urlparse
@@ -80,13 +81,13 @@ def _round_datetime_ms(timestamp: datetime) -> datetime:
     return timestamp - timedelta(microseconds=subtract_ms)
 
 
-def main(sys_args) -> int:
+def main(sys_args=None) -> int:
     """Parser main method"""
     logger.debug("Starting hdf5 converter")
 
     parser = _create_parser()
     args = parser.parse_args(sys_args)
-    minio_client = get_minio_client(args)
+    minio_client = get_minio_client(args or sys.argv[1:])
     logger.info("Using source %s", args.source)
 
     # connect to storage
@@ -155,6 +156,4 @@ def main(sys_args) -> int:
 
 
 if __name__ == "__main__":
-    import sys
-
     sys.exit(main(sys.argv[1:]))