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 1.68%. Comparing base (3a9607b) to head (f6393ef).
⚠️ Report is 5 commits behind head on master.
✅ 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%   1.68%   -0.04%     
=========================================
  Files         420     428       +8     
  Lines       45910   46749     +839     
=========================================
  Hits          787     787              
- Misses      45036   45875     +839     
  Partials       87      87              

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