fix(doc): copy error when range is empty

[Jocs]

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

close #1485

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 32.58%. Comparing base (885ba4b) to head (7185144).

Files	Patch %	Lines
...ocs-ui/src/services/clipboard/clipboard.service.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1488      +/-   ##
==========================================
- Coverage   32.59%   32.58%   -0.01%     
==========================================
  Files         905      905              
  Lines       50121    50123       +2     
  Branches    10431    10432       +1     
==========================================
  Hits        16335    16335              
- Misses      33786    33788       +2     

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