fix: allow updating kube config file without contexts, clusters, users (#23714)

[adietish]

fixes eclipse-che/che#23714

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 25.35%. Comparing base (71098f6) to head (34605e1).
⚠️ Report is 284 commits behind head on main.

Files with missing lines	Patch %	Lines
...ools/gateway/view/steps/DevSpacesServerStepView.kt	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #244       +/-   ##
==========================================
+ Coverage   0.00%   25.35%   +25.35%     
==========================================
  Files          4       40       +36     
  Lines         26     2090     +2064     
  Branches       0      429      +429     
==========================================
+ Hits           0      530      +530     
- Misses        26     1486     +1460     
- Partials       0       74       +74     

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[adietish]

@vrubezhny please review