metadataonlyctx: don't crash when reusing the manifest with deletions This was originally fixed by Mateusz Kwapich for the `metaedit` command in fb-hgext with a test for the `metaedit` command. It didn't get upstreamed because `metaedit` was not in core. This patch fixes the crash and adds a test about `metadataonlyctx` to avoid future regressions. Differential Revision: https://phab.mercurial-scm.org/D550

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fixbundle() {

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    grep -v 'saving bundle' | grep -v 'saved backup' | \

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        grep -v added | grep -v adding | \

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        grep -v "unable to find 'e' for patching" | \

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        grep -v "e: No such file or directory" | \

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    cat

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}