Prevent internal validator errors when entries are missing ID/type

[ml-evs]

Closes #1272.

[codecov]

Codecov Report

Merging #1273 (6d3dbbd) into master (96543fe) will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #1273      +/-   ##
==========================================
- Coverage   91.23%   91.21%   -0.02%     
==========================================
  Files          72       72              
  Lines        4299     4301       +2     
==========================================
+ Hits         3922     3923       +1     
- Misses        377      378       +1     

Flag	Coverage Δ
project	91.21% <66.66%> (-0.02%)	⬇️
validator	90.60% <66.66%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
optimade/validator/validator.py	83.78% <66.66%> (-0.13%)	⬇️

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