feat(cli): return immediately when stdin is empty #15
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With this change, calling `bitcli` (or `bitcli shorten`) without any arguments will no longer wait for the standard input indefinitely if it's empty and its handle does not refer to a terminal/tty.
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With this change, calling
bitcli(orbitcli shorten) without any arguments will no longer wait for the standard input indefinitely if it's empty and its handle does not refer to a terminal/tty.