[Rpm-maint] [rpm-software-management/rpm] Macro with empty body causes abort (Issue #4195)

[Michal Domonkos]

dmnks created an issue (rpm-software-management/rpm#4195)

**Describe the bug**
Defining a macro without a body terminates with an assertion error (abort).

**To Reproduce**
Steps to reproduce the behavior:
```
$ rpm --eval '%define this' --eval '%this'
```

**Expected behavior**
```
error: Macro %this has empty body
```

**Output**
```
/usr/include/c++/15/bits/basic_string.h:1452: constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::back() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; reference = char&]: Assertion '!empty()' failed.
Aborted                    (core dumped) rpm --eval '%define this' --eval '%this'
```

**Environment**
 - OS / Distribution: Fedora 44
 - Version: master branch

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