## Problem
- follow-up to #2493
- https://trello.com/c/czY7e3c0
For SLES16 the minimal system can be without libzypp. If it is case
together with onlyRequires flag, then software service crashes when
trying to load zypp.conf.
## Solution
Add check if file exists and if not, just log it and continue.
Also change as agreed modification of zypp.conf to explicitly write
onlyRequires if user explicitly mention it in profile to not just use
libzypp default.
## Testing
- *Tested manually*
## Documentation
*Remember to look at it from the user's perspective. Yes you have made
the compiler happy.*
*But will the **humans** even know about your contribution? Sometimes
they cannot miss it,*
*other times they need advertisement and explanation.*
*Look for relevant sections and adjust:*
- The description parts of the [JSON schema][profile.schema.json]
- Is the CLI affected? See [cli.md][] for a complete overview,
change the `///` comments (rust doc)
and update the .md with `cargo xtask markdown`
- <https://agama-project.github.io/> ([source][gh.io])
- Run: `git ls-files '*.md'`
[cli.md]:
https://github.com/agama-project/agama-project.github.io/blob/main/docs/user/cli.md
[profile.schema.json]:
https://github.com/agama-project/agama/blob/master/rust/agama-lib/share/profile.schema.json
[gh.io]: https://github.com/agama-project/agama-project.github.io/
---------
Co-authored-by: Ladislav Slezák <lslezak@suse.com>
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