Allow server variable enum to be unset

[atombender]

Fixes #1272.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.90%. Comparing base (4024c9f) to head (99f5080).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1273   +/-   ##
=======================================
  Coverage   73.90%   73.90%           
=======================================
  Files         189      189           
  Lines       12855    12855           
=======================================
  Hits         9501     9501           
  Misses       2805     2805           
  Partials      549      549           

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[tdakkota]

Please, edit your commit to follow Conventional Commits. Commit linter is not happy about period at the end of commit message, I guess.

Everything else looks good to me. Thank you.

[atombender]

@tdakkota Seems overly picky, but okay, done.