Fix: list user projects panic

[chivalryq]

Description of your changes

1. fix panic:

2. shorten the indent

Fixes #

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run yarn lint to ensure the frontend changes are ready for review.
• Run make reviewableto ensure the server changes are ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

Special notes for your reviewer

[codecov]

Codecov Report

Patch coverage: 60.00% and project coverage change: -0.15 ⚠️

Comparison is base (2509508) 61.17% compared to head (d580595) 61.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #810      +/-   ##
==========================================
- Coverage   61.17%   61.03%   -0.15%     
==========================================
  Files         109      109              
  Lines       19129    19134       +5     
==========================================
- Hits        11703    11678      -25     
- Misses       5980     6003      +23     
- Partials     1446     1453       +7     

Flag	Coverage Δ
apiserver-unittests	33.76% <60.00%> (-0.06%)	⬇️
server-e2e-tests	49.67% <0.00%> (-0.12%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/server/domain/service/user.go	54.15% <60.00%> (-1.21%)	⬇️

... and 8 files with indirect coverage changes

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[barnettZQG]

LGTM

[github-actions]

Successfully created backport PR #812 for release-1.8.