Allow optional strands

[cortadocodes]

Contents (#688)

New features

• Allow optional strands

Dependencies

• Use twined=0.6.0

Fixes

• Skip dataset validation for missing optional manifests

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.65%. Comparing base (9092646) to head (a82f807).
Report is 90 commits behind head on main.

Files with missing lines	Patch %	Lines
octue/runner.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #688      +/-   ##
==========================================
+ Coverage   94.50%   94.65%   +0.15%     
==========================================
  Files          83       83              
  Lines        3547     3595      +48     
==========================================
+ Hits         3352     3403      +51     
+ Misses        195      192       -3     

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