feat: ignore NAs in feature raster stack

[be-marc]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.11321% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.70%. Comparing base (b08c06b) to head (23a496c).
⚠️ Report is 116 commits behind head on main.

Files with missing lines	Patch %	Lines
R/predict_spatial.R	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   98.46%   98.70%   +0.23%     
==========================================
  Files           5        7       +2     
  Lines         261      308      +47     
==========================================
+ Hits          257      304      +47     
  Misses          4        4              

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