Treat NaN as inconclusive

[dthomson25]

Closes #180

[codecov]

Codecov Report

Merging #275 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #275      +/-   ##
=========================================
+ Coverage   83.65%   83.7%   +0.04%     
=========================================
  Files          63      63              
  Lines        5561    5553       -8     
=========================================
- Hits         4652    4648       -4     
+ Misses        667     665       -2     
+ Partials      242     240       -2

Impacted Files	Coverage Δ
metricproviders/prometheus/prometheus.go	100% <100%> (ø)	⬆️
utils/template/template.go
utils/query/query.go	100% <0%> (ø)
metricproviders/job/job.go	91.52% <0%> (+2.21%)	⬆️

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