[Rpm-maint] [rpm-software-management/rpm] Don't print empty return of --eval macro expansion (PR #3804)

[Panu Matilainen]

pmatilai left a comment (rpm-software-management/rpm#3804)

The comment about Lua is misleading, this covers and affects all macros.

It's a good change technically, those empty lines can drive one nuts. The question is whether we dare to make it, because this is 20+ year old behavior and who knows what depends on that exact behavior. Basically there's no way to find out, expect by trying it. I think we should try.

If you update the comment I'll merge, just with an understanding that there is a chance we have to back out of it if it breaks the world. 

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