fix: object test agains null or undefined

[unional]

No description provided.

[codecov]

Codecov Report

Merging #35 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #35   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines          78     78           
  Branches       23     23           
=====================================
  Hits           78     78

Impacted Files	Coverage Δ
src/createSatisfier.ts	100% <100%> (ø)	⬆️

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[coveralls]

Coverage remained the same at 100.0% when pulling 7e2bfaa on obj-vs-null into 8cfa9ea on master.