[Rpm-maint] [rpm-software-management/rpm] error: invalid version: v"3" (but only in a a complex conditional) (Issue #1883)

[Michael Schroeder]

Yes, here's a smaller reproducer:
```
rpm --eval '%[v"0" && v"0"]'
```
This happens because getValuebuf() returns an empty string if RPMEXPR_DISCARD is set.
A fix could be to change the valueMakeVersion() call to:
```
v = valueMakeVersion(state->flags & RPMEXPR_DISCARD ? "0" : temp);
```
Or we can change getValuebuf to return "0" instead of "" if RPMEXPR_DISCARD is set.

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