feat: allow configuring that there is no genome sequence

[holtgrewe]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (0a6a109) 88.32% compared to head (8d05253) 88.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
- Coverage   88.32%   88.31%   -0.02%     
==========================================
  Files          19       19              
  Lines        7454     7453       -1     
==========================================
- Hits         6584     6582       -2     
- Misses        870      871       +1     

Impacted Files	Coverage Δ
src/validator/mod.rs	62.29% <ø> (ø)
src/mapper/assembly.rs	80.34% <100.00%> (+0.08%)	⬆️
src/mapper/variant.rs	90.79% <100.00%> (+0.02%)	⬆️

... and 2 files with indirect coverage changes

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