fix: projecting over inexistent fields

[eddycharly]

Explanation

Fix projecting over inexistent fields.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 23.03%. Comparing base (f49c3a4) to head (e233d07).

Files	Patch %	Lines
pkg/engine/assert/parse.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #432      +/-   ##
==========================================
+ Coverage   22.75%   23.03%   +0.27%     
==========================================
  Files          85       85              
  Lines        3419     3417       -2     
==========================================
+ Hits          778      787       +9     
+ Misses       2562     2551      -11     
  Partials       79       79              

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