Fix traverse_nested when value is not compatible with ItemAdapter

[VMRuiz]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.51%. Comparing base (6ea9f67) to head (6e09889).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #450   +/-   ##
=======================================
  Coverage   79.51%   79.51%           
=======================================
  Files          76       76           
  Lines        3237     3237           
  Branches      537      537           
=======================================
  Hits         2574     2574           
  Misses        593      593           
  Partials       70       70           

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