Fix misleading error message

[danidoni]

This PR fixes the misleading error message thrown in this endpoint

Replace this line with a description of your changes. Please follow the suggestions in the comment below.

---

If this PR requires any particular action or consideration before deployment,
please check the reasons or add your own to the list:

• Requires a database migration that can cause downtime. Postpone deployment until maintenance window[1].
• Contains a data migration that can cause temporary inconsistency, so should be run at a specific point of time.
• Changes some configuration files (e.g. options.yml), so the changes have to be applied manually in the reference server.
• A new Feature Toggle[2] should be enabled in the reference server.
• Proper documentation or announcement has to be published upfront since the introduced changes can confuse the users.

[1] https://github.com/openSUSE/open-build-service/wiki/Deployment-of-build.opensuse.org#when-there-are-migrations
[2] https://github.com/openSUSE/open-build-service/wiki/Feature-Toggles-%28Flipper%29#you-want-real-people-to-test-your-feature

[danidoni]

Person

[dmarcoux]

The comment just above the command action is also wrong. I suggest removing it completely.

open-build-service/src/api/app/controllers/person_controller.rb

Line 27 in 574979c

# Returns a list of all users (that optionally start with a prefix)

[danidoni]

The comment just above the command action is also wrong. I suggest removing it completely.

open-build-service/src/api/app/controllers/person_controller.rb

Line 27 in 574979c

# Returns a list of all users (that optionally start with a prefix)

Removed