fix(baremetal): set partition in request only if not nil

[Laure-di]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 1.71%. Comparing base (e00b6fe) to head (0fa15ed).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/services/baremetal/server.go	0.00%	10 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #3518   +/-   ##
======================================
  Coverage    1.71%   1.71%           
======================================
  Files         420     420           
  Lines       45909   45909           
======================================
  Hits          787     787           
  Misses      45035   45035           
  Partials       87      87           

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