CLI: require explicit "-" to identify via stdin

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Migrated from D3029 (view on Phabricator)

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Rebasing onto 6ac6cb75...

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commit 7b2cc1fafd9174369897668e760cd20134b2bab9
Author: Stefano Zacchiroli <zack@upsilon.cc>
Date:   Fri Apr 17 17:25:03 2020 +0200

    CLI: require explicit "-" to identify via stdin

See https://jenkins.softwareheritage.org/job/DMOD/job/tests-on-diff/38/ for more details.

As suggested on IRC, you can just set required=True on @click.argument (and drop the if not objects:). But either way works.

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