Fix: nil check panic

[Somefive]

Fixes #74

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (e020ce3) 86.27% compared to head (8091d34) 86.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   86.27%   86.31%   +0.03%     
==========================================
  Files          73       74       +1     
  Lines        3272     3280       +8     
==========================================
+ Hits         2823     2831       +8     
  Misses        344      344              
  Partials      105      105              

Flag	Coverage Δ
unit-test	86.31% <100.00%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
cue/cuex/compiler.go	83.19% <100.00%> (ø)
util/runtime/nil.go	100.00% <100.00%> (ø)

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