fix: "$in needs an array" error from mongo FindByIDs

[rot1024]

What I've done

An error "$in needs an array" returns from MongoDB when ids arg of internal/infrastrucutre/mongo.*.FindByIDs methods is nil.

How I tested

[codecov]

Codecov Report

Merging #142 (4b701f3) into main (35f9db5) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
- Coverage   34.61%   34.57%   -0.04%     
==========================================
  Files         349      349              
  Lines       31755    31788      +33     
==========================================
  Hits        10992    10992              
- Misses      19760    19793      +33     
  Partials     1003     1003              

Impacted Files	Coverage Δ
internal/infrastructure/mongo/asset.go	24.48% <0.00%> (-0.78%)	⬇️
internal/infrastructure/mongo/dataset.go	0.00% <0.00%> (ø)
internal/infrastructure/mongo/dataset_schema.go	0.00% <0.00%> (ø)
internal/infrastructure/mongo/layer.go	0.00% <0.00%> (ø)
internal/infrastructure/mongo/plugin.go	0.00% <0.00%> (ø)
internal/infrastructure/mongo/project.go	0.00% <0.00%> (ø)
internal/infrastructure/mongo/property.go	0.00% <0.00%> (ø)
internal/infrastructure/mongo/property_schema.go	0.00% <0.00%> (ø)
internal/infrastructure/mongo/scene.go	0.00% <0.00%> (ø)
internal/infrastructure/mongo/tag.go	0.00% <0.00%> (ø)
... and 4 more