Try to expose NPE with Cobertura parser in #473

[uhafner]

Seems that our parser already handles that file correctly.

See https://github.com/jenkinsci/code-coverage-api-plugin/issues/473

[codecov]

Codecov Report

Merging #474 (5418870) into master (d3e9c96) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #474      +/-   ##
============================================
- Coverage     72.46%   72.38%   -0.09%     
  Complexity     1005     1005              
============================================
  Files            87       87              
  Lines          3741     3741              
  Branches        435      435              
============================================
- Hits           2711     2708       -3     
- Misses          884      885       +1     
- Partials        146      148       +2     

Impacted Files	Coverage Δ
...va/io/jenkins/plugins/coverage/CoverageAction.java	53.33% <0.00%> (-15.56%)	⬇️
...ns/coverage/adapter/parser/JavaCoverageParser.java	82.05% <0.00%> (+1.28%)	⬆️
...enkins/plugins/coverage/adapter/util/XMLUtils.java	58.57% <0.00%> (+4.28%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more