[Rpm-maint] [rpm-software-management/rpm] Fix short circuiting of version strings in expressions (PR #2101)

[Michael Schroeder]

We use an empty string when discarding a value due to short circuiting, but
an empty string is not allowed for versions. So use "0" in that case.

Fixes: #1883
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/2101

-- Commit Summary --

  * Fix short circuiting of version strings in expressions

-- File Changes --

    M rpmio/expression.c (2)
    M tests/rpmmacro.at (2)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/2101.patch
https://github.com/rpm-software-management/rpm/pull/2101.diff

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