fix: prevent the creation of empty named selections

[RobPasMue]

Description

Avoid the server side error when an empty Named Selection attempts to be created.

Issue linked

Closes #2059

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate unit tests.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have added the minimum version decorator to any new backend method implemented.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.61%. Comparing base (33a3df2) to head (4d0d3ba).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2063   +/-   ##
=======================================
  Coverage   92.60%   92.61%           
=======================================
  Files         136      136           
  Lines        9810     9812    +2     
=======================================
+ Hits         9085     9087    +2     
  Misses        725      725           

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