make sure caption actually exists

[rpnykanen]

Prevent error if there is no caption at all.

[codecov-commenter]

Codecov Report

Merging #603 (60886b5) into main (4c85285) will not change coverage.
Report is 3 commits behind head on main.
The diff coverage is n/a.

❗ Current head 60886b5 differs from pull request most recent head 12f4640. Consider uploading reports for the commit 12f4640 to get more accurate results

@@            Coverage Diff            @@
##               main     #603   +/-   ##
=========================================
  Coverage     12.74%   12.74%           
  Complexity      236      236           
=========================================
  Files            30       30           
  Lines           902      902           
=========================================
  Hits            115      115           
  Misses          787      787           

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[khalima]

Nice job! 🚀