Hide copy button if array is empty

[christianlupus]

Topic and Scope

Closes #1823

This is just a minor UI issue fixed.

Concerns/issues

None

Formal requirements

There are some formal requirements that should be satisfied. Please mark those by checking the corresponding box.

• I did check that the app can still be opened and does not throw any browser logs
• I created tests for newly added PHP code (check this if no PHP changes were made)
• I updated the OpenAPI specs and added an entry to the API changelog (check if API was not modified)
• I notified the matrix channel if I introduced an API change

[christianlupus]

/approve

[nextcloud-cookbook-bot]

Automatically approved by GitHub action on behalf of /approve

[codecov]

Codecov Report

Merging #1844 (05da172) into master (4920340) will decrease coverage by 5.87%.
Report is 3 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1844      +/-   ##
==========================================
- Coverage   79.67%   73.80%   -5.87%     
==========================================
  Files          89       89              
  Lines        2573     2573              
==========================================
- Hits         2050     1899     -151     
- Misses        523      674     +151     

Flag	Coverage Δ
integration	21.88% <ø> (ø)
migration	?
unittests	56.00% <ø> (ø)

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see 7 files with indirect coverage changes