[Rpm-maint] [rpm-software-management/rpm] rpm is unable to find existing group (4.20.0 regression) (Issue #3594)

[Jan Palus]

jpalus created an issue (rpm-software-management/rpm#3594)

**Describe the bug**
rpm 4.20.x fails with ie:
```
warning: group http does not exist - using root
```
even though group exists:
```
$ grep http /etc/group
http::51:nginx
```

**To Reproduce**
Steps to reproduce the behavior:
1. Create a group with empty password field
2. Use the group in spec and build package
3. Try to install package with rpm 4.20.x

**Expected behavior**
Files have proper group

**Environment**
 - OS / Distribution: PLD 3.0
 - Version rpm 4.20.1
 
**Additional context**
I believe the regression was introduced with commit https://github.com/rpm-software-management/rpm/commit/f3eaeeb7341085e1850e914350cf1f33d538320d which makes unfortunate use of `strtok_r`. `strtok*` functions by definition do not handle empty fields since they are required to:
> Upon successful completion, strtok() shall return a pointer to the first byte of a token

(https://pubs.opengroup.org/onlinepubs/9799919799/)
and there's not a single byte in empty field.


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