Fix handling of default value for task argument
@@ -153,7 +153,7 @@ def main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('outcomes', metavar='OUTCOMES.CSV',
help='Outcome file to analyze')
- parser.add_argument('task', default='all',
+ parser.add_argument('task', default='all', nargs='?',
help='Analysis to be done. By default, run all tasks. '
'With one or more TASK, run only those. '
'TASK can be the name of a single task or '
