Type of change(s)

• Bug fix
• Feature / enhancement
• Infrastructure / tooling (CI, build, deps, tests)
• Documentation

What changed and why

• Fixed in case of empty string name for sorting
• Scenario I order by firstname, but i have contacts with only surname, currently they are added on the bottom of the list (even they are called AASurname)
• New behavior:

1. If order by firstname but firstname blank use surname (fixes the described issue)
2. If order by middlename but middlename blank use firstname (because more likely firstname is available then middlename)
3. If order by surname but surname blank use firstname (additional case)

Tests performed

• unable to test since i couldn't get the library to run locally 👎

Closes the following issue(s)

• Closes When First Name starts with White Space, the card is Filed at the End, after Z Contacts#195

Checklist

• I read the contribution guidelines.
• I manually tested my changes on device/emulator (if applicable).
• I updated the "Unreleased" section in CHANGELOG.md (if applicable).
• I have self-reviewed my pull request (no typos, formatting errors, etc.).
• I understand every change in this pull request.