Critical Fix to virial radii

[carlrodriguez]

need to switch kwargs.pop to kwargs.get, since the virial radius was used in multiple places.

[codecov[bot]]

Codecov Report

Merging #529 (5187d0c) into develop (a84237b) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #529   +/-   ##
========================================
  Coverage    87.06%   87.07%           
========================================
  Files           40       40           
  Lines        25385    25391    +6     
========================================
+ Hits         22101    22107    +6     
  Misses        3284     3284           

Impacted Files	Coverage Δ
cosmic/sample/sampler/cmc.py	84.04% <100.00%> (ø)
cosmic/sample/initialcmctable.py	95.49% <0.00%> (+0.14%)	:arrow_up:
cosmic/sample/initialbinarytable.py	94.44% <0.00%> (+0.16%)	:arrow_up:

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[katiebreivik]

looks good!