Don't recurse on null in TryExpandTraverser.

[danielcweber]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.12%. Comparing base (805f364) to head (819c89b).
Report is 1 commits behind head on 12.x.

Files with missing lines	Patch %	Lines
...port.NewtonsoftJson/Extensions/JTokenExtensions.cs	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             12.x    #1775   +/-   ##
=======================================
  Coverage   83.11%   83.12%           
=======================================
  Files         252      252           
  Lines        6821     6825    +4     
  Branches     1484     1486    +2     
=======================================
+ Hits         5669     5673    +4     
  Misses        509      509           
  Partials      643      643           

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