FIX: division by zero error

[artem-fedorov]

No description provided.

[codecov-io]

Codecov Report

Merging #168 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #168      +/-   ##
==========================================
+ Coverage   70.67%   70.68%   +<.01%     
==========================================
  Files          44       44              
  Lines        4099     4100       +1     
  Branches      724      724              
==========================================
+ Hits         2897     2898       +1     
+ Misses        909      908       -1     
- Partials      293      294       +1

Impacted Files	Coverage Δ
...plugins/performance/reports/PerformanceReport.java	83.89% <100%> (+0.06%)	⬆️
.../hudson/plugins/performance/reports/UriReport.java	68.94% <0%> (ø)	⬆️

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