Fix NPE

[wheelerlaw]

Closes #347

[codecov-io]

Codecov Report

Merging #348 (7dbc469) into master (6cb431f) will increase coverage by 0.03%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #348      +/-   ##
============================================
+ Coverage     69.86%   69.90%   +0.03%     
  Complexity      697      697              
============================================
  Files            80       80              
  Lines          2741     2741              
  Branches        568      569       +1     
============================================
+ Hits           1915     1916       +1     
+ Misses          612      610       -2     
- Partials        214      215       +1     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/com/networknt/schema/JsonSchema.java	92.00% <0.00%> (+0.79%)	49.00 <0.00> (ø)

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[stevehu]

@wheelerlaw Thanks a lot for your contribution.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.90%. Comparing base (6cb431f) to head (7dbc469).
Report is 441 commits behind head on master.

Files with missing lines	Patch %	Lines
src/main/java/com/networknt/schema/JsonSchema.java	0.00%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #348      +/-   ##
============================================
+ Coverage     69.86%   69.90%   +0.03%     
  Complexity      697      697              
============================================
  Files            80       80              
  Lines          2741     2741              
  Branches        568      569       +1     
============================================
+ Hits           1915     1916       +1     
+ Misses          612      610       -2     
- Partials        214      215       +1     

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