fix(ui): fix layout service throwing error

[wzhudev]

• I am sure that the code is update-to-date with the dev branch.

close #1489

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 32.78%. Comparing base (5781a63) to head (674d391).
Report is 3 commits behind head on dev.

Files	Patch %	Lines
packages/ui/src/services/layout/layout.service.ts	0.00%	2 Missing ⚠️
...kages/docs-ui/src/controllers/doc-ui.controller.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1490      +/-   ##
==========================================
+ Coverage   32.76%   32.78%   +0.02%     
==========================================
  Files         905      905              
  Lines       50202    50244      +42     
  Branches    10457    10469      +12     
==========================================
+ Hits        16451    16475      +24     
- Misses      33751    33769      +18     

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