#61 Fix filter when property does not exist

[spyzhov]

Close #61

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (9c5214f) 92.29% compared to head (a582326) 92.30%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
+ Coverage   92.29%   92.30%   +0.01%     
==========================================
  Files          10       10              
  Lines        2817     2821       +4     
==========================================
+ Hits         2600     2604       +4     
  Misses        144      144              
  Partials       73       73              

Flag	Coverage Δ
unittests	92.30% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
buffer.go	99.03% <100.00%> (+<0.01%)	⬆️
jsonpath.go	83.15% <100.00%> (ø)

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