Add a placeholder item for empty activity list

[claucambra]

Adds a placeholder item for empty activity lists (e.g. file has no recent activities)

Below screenshot is a simulated example of an empty activity list in the system tray as I didn't have any files not modified in the past 6 months

Closes #4342

Signed-off-by: Claudio Cambra [email protected]

[codecov]

Codecov Report

Merging #4959 (bc5ab59) into master (51f3131) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head bc5ab59 differs from pull request most recent head bc08559. Consider uploading reports for the commit bc08559 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4959      +/-   ##
==========================================
- Coverage   56.98%   56.98%   -0.01%     
==========================================
  Files         138      138              
  Lines       17232    17232              
==========================================
- Hits         9820     9819       -1     
- Misses       7412     7413       +1     

Impacted Files	Coverage Δ
src/libsync/vfs/cfapi/cfapiwrapper.cpp	72.60% <0.00%> (-0.23%)	⬇️

[mgallien]

thanks

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-4959-bc08559655181029af408eec7f28ee4b6ffba2a7-x86_64.AppImage

To test this change/fix you can simply download above AppImage file and test it.

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