[Rpm-maint] [rpm-software-management/rpm] lua rpm_vercmp error message if second argument is broken (Issue #2165)

[AvoidMe]

I found a small issue while was playing with lua in rpm spec:
```
➜  rpm --eval "%{lua:rpm.interactive()}"

RPM Interactive Lua 5.4 Interpreter
> print(rpm.vercmp('1', '1'))
0
> print(rpm.vercmp('', '1'))         
[string "<lua>"]:1: bad argument #1 to 'vercmp' (invalid version )
> print(rpm.vercmp('1', '')) 

> 
```
If first argument is wrong in `rpm.vercmp()` - meaningful error message as expected
if second argument is wrong - nothing happens and nil returned

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