Make --output required.
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@ -49,7 +49,7 @@ def main(argv):
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('image_files', nargs='+')
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parser.add_argument('--output')
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parser.add_argument('--output', required=True)
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parser.add_argument('--horizontal', action='store_true')
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parser.add_argument('--vertical', action='store_true')
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parser.add_argument('--gap', type=int, default=0)
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