fix: no explain case, improved readability.

[bwplotka]

📑 Description

k8sgpt analyze (without explain) is not working due to lack of AI provider. This was weird to me given enable AI setting in k8s operator exists (probably not working due to this issue as well). I assume no --explain means no AI should be touched.

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

[codecov]

Codecov Report

Attention: 45 lines in your changes are missing coverage. Please review.

Comparison is base (70c6892) 46.58% compared to head (7969c9a) 46.54%.

Files	Patch %	Lines
pkg/analysis/analysis.go	0.00%	37 Missing ⚠️
pkg/analysis/output.go	0.00%	6 Missing ⚠️
pkg/server/analyze.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #825      +/-   ##
==========================================
- Coverage   46.58%   46.54%   -0.05%     
==========================================
  Files          27       27              
  Lines        2196     2198       +2     
==========================================
  Hits         1023     1023              
- Misses       1135     1137       +2     
  Partials       38       38              

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[thschue]

Thanks for this contribution! LGTM