Fix number format exception

[artem-fedorov]

No description provided.

[codecov-io]

Codecov Report

Merging #83 into master will increase coverage by 0.75%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
+ Coverage   46.62%   47.37%   +0.75%     
==========================================
  Files          31       30       -1     
  Lines        2430     2461      +31     
  Branches      396      400       +4     
==========================================
+ Hits         1133     1166      +33     
+ Misses       1171     1168       -3     
- Partials      126      127       +1

Impacted Files	Coverage Δ
...va/hudson/plugins/performance/JMeterCsvParser.java	8.33% <ø> (ø)	✅
...n/java/hudson/plugins/performance/JUnitParser.java	90.69% <0%> (-9.31%)	❌
...a/hudson/plugins/performance/ThroughputReport.java
.../hudson/plugins/performance/PerformanceReport.java	53.62% <0%> (+1.44%)	✅
...in/java/hudson/plugins/performance/HttpSample.java	89.47% <0%> (+5.26%)	✅
...udson/plugins/performance/ThroughputUriReport.java	100% <0%> (+18.18%)	✅

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