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Avoid crash if not provide book_name (#431)
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@ -333,8 +333,11 @@ So you are close to reaching the limit. You have to choose your own value, there
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options = parser.parse_args()
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if not options.book_name:
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print(f"Error: please provide the path of your book using --book_name <path>")
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exit(1)
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if not os.path.isfile(options.book_name):
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print(f"Error: {options.book_name} does not exist.")
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print(f"Error: the book {options.book_name!r} does not exist.")
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exit(1)
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PROXY = options.proxy
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