Fix: application table view crash when app have no labels

[chivalryq]

Description of your changes

Fixes #823

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 has no change and project coverage change: -11.79 ⚠️

Comparison is base (2931e13) 60.91% compared to head (5d73893) 49.12%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #842       +/-   ##
===========================================
- Coverage   60.91%   49.12%   -11.79%     
===========================================
  Files         110      110               
  Lines       19406    19406               
===========================================
- Hits        11821     9534     -2287     
- Misses       6122     8621     +2499     
+ Partials     1463     1251      -212     

Flag	Coverage Δ
apiserver-unittests	?
server-e2e-tests	49.12% <ø> (-0.08%)	⬇️

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

see 43 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[github-actions]

Successfully created backport PR #843 for release-1.8.