Fix flake8 warnings

MDUYN · MDUYN · commit ea3e8bda893a · 2026-03-18T12:42:18.000+01:00
diff --git a/investing_algorithm_framework/cli/validate_backtest_checkpoints.py b/investing_algorithm_framework/cli/validate_backtest_checkpoints.py
@@ -51,6 +51,7 @@ def validate_and_create_checkpoints(
 
     if verbose_output_file is not None:
         verbose_file_handle = open(verbose_output_file, 'w')
+
         def echo(msg):
             verbose_file_handle.write(msg + "\n")
     else:
