[Rpm-maint] [rpm-software-management/rpm] Add an error message when rpm fails to open a pipe for shell expansion (#862)

[Panu Matilainen]

pmatilai approved this pull request.

Thanks. The danger with including the command at all is that people will think the command failed, but considering I don't think anybody has ever *seen* this fail in the first place, maybe we can live with the "danger" :D 



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