Fix for decoding presence containers in ydk-cpp

[ghost]

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[codecov-io]

Codecov Report

Merging #437 into master will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #437      +/-   ##
==========================================
+ Coverage   83.56%   83.65%   +0.09%     
==========================================
  Files         109      109              
  Lines       13084    13084              
  Branches     1919     1919              
==========================================
+ Hits        10933    10945      +12     
+ Misses       1595     1583      -12     
  Partials      556      556

Impacted Files	Coverage Δ
...cases/python/expected/ydk/models/ydktest_sanity.py	71.71% <0%> (ø)	⬆️
ydkgen/builder/test_case/test_value_builder.py	91.21% <0%> (ø)	⬆️
ydkgen/builder/test_case/test_cases_builder.py	82.01% <0%> (+4.31%)	⬆️

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