[JENKINS-72449] Add a toggle to ignore empty results

[uhafner]

Otherwise, the parsers will throw an exception.

Will fix jenkinsci/code-coverage-api-plugin#723.

See also https://issues.jenkins.io/browse/JENKINS-72449.

[github-actions]

☀️ Quality Monitor

• 🚦 Tests: 263 tests passed
• 👣 Code Coverage: 96% coverage achieved
• 🔬 Mutation Coverage: 93% mutations killed
• ⚠️ Style: No warnings found
• 🐛 Bugs: No warnings found

More details are available in the GitHub Checks Result.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b5faac6) 95.72% compared to head (4fa05a0) 95.75%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #66      +/-   ##
============================================
+ Coverage     95.72%   95.75%   +0.02%     
- Complexity      695      698       +3     
============================================
  Files            26       26              
  Lines          1684     1695      +11     
  Branches        230      227       -3     
============================================
+ Hits           1612     1623      +11     
- Misses           39       40       +1     
+ Partials         33       32       -1     

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[github-actions]

☀️ Quality Monitor

• 🚦 Tests: 263 tests passed
• 👣 Code Coverage: 96% coverage achieved
• 🔬 Mutation Coverage: 93% mutations killed
• ⚠️ Style: No warnings found
• 🐛 Bugs: No warnings found

More details are available in the GitHub Checks Result.