[beta] Revert "When a dependency does not have a version, git or path…#9912

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bors merged 2 commits intorust-lang:rust-1.56.0from ehuss:beta-revert-9686

Sep 14, 2021

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[beta] Revert "When a dependency does not have a version, git or path, fails directly"
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Auto merge of rust-lang#9906 - camelid:fix-warnings, r=alexcrichton

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