Fix nil ptr for newRS

[dthomson25]

No description provided.

[codecov]

Codecov Report

Merging #233 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #233      +/-   ##
==========================================
+ Coverage   84.82%   84.83%   +<.01%     
==========================================
  Files          47       47              
  Lines        4244     4246       +2     
==========================================
+ Hits         3600     3602       +2     
  Misses        455      455              
  Partials      189      189

Impacted Files	Coverage Δ
rollout/canary.go	86.23% <ø> (-0.06%)	⬇️
rollout/replicaset.go	77.01% <100%> (+0.82%)	⬆️

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